Correct Answer: C

Rationale: The comma (,) is used to separate the introductory clause 'After a twelve-hour workday' from the main clause 'James was exhausted when he heard the news.' This punctuation correctly indicates the relationship between the two clauses without interrupting the flow of the sentence. Choice A (.), a period, would create two separate sentences, which is not appropriate in this context. Choice B (;) is too strong of a pause and semicolons are typically used to connect closely related independent clauses. Choice D (-) is an em dash, which is used to set off an abrupt break or interruption in the sentence, not to separate an introductory clause from the main clause.

Correct Answer: B

Rationale: The correct punctuation in this case is to use a comma (,) to set off the nonrestrictive clause 'whose death shocked America in April of 2016.' This clause provides additional information about the artist Prince without changing the essential meaning of the sentence. Choice A has a semicolon (;) which is incorrect as it separates two closely related independent clauses. Choice C uses em dashes (-) which are incorrect as they should be used for emphasis or to set off information. Choice D uses a colon (:) which is incorrect as it introduces a list or an explanation, not additional information about the artist Prince. Therefore, the correctly punctuated sentence is: 'The artist Prince, whose death shocked America in April of 2016, was one of the most successful musical artists of the last century.'

Correct Answer: B

Rationale: The comma following 'Day' is used incorrectly. Commas are typically not used after single-word identifiers like 'Day' in a sentence unless they are part of a list. In this case, the holiday is referred to as 'Parents' Day,' where the apostrophe is used correctly to indicate possession. The comma following 'Day' is unnecessary and should be removed for proper punctuation. Choices A and D both use apostrophes correctly to indicate possession, so they are not incorrect. The comma following 'Congo' in choice C is necessary to set off the introductory phrase 'a public holiday in the Democratic Republic of Congo.' Therefore, the correct answer is B.

Correct Answer: C

Rationale: In the sentence, 'widely' is used as an adverb. It modifies the adjective 'available,' describing the extent to which professional dental care is available. An adverb can modify verbs, adjectives, or other adverbs. In this case, 'widely' modifies the adjective 'available,' making it an adverb. Choice A, 'adjective,' is incorrect because 'widely' is not describing a noun. Choice B, 'noun,' is incorrect because 'widely' is not a noun. Choice D, 'verb,' is incorrect because 'widely' is not being used as a verb in the sentence.

Correct Answer: B

Rationale: In sentence B, "Ukrainians" is capitalized because it is referring to a specific group of people, and "Malanka" is also capitalized as it is a holiday name. This follows the rules of capitalization for proper nouns. Choices A, C, and D contain correct capitalization, but they also include additional capitalizations that are unnecessary. For instance, in choice A, "African white-backed vultures" should not be capitalized unless it is part of a proper noun or a title. In choice C, while "Neptune" and "Earth" should be capitalized as they are names of celestial bodies, the word "sun" is not capitalized unless it is used as part of the proper noun "Sun." Choice D correctly capitalizes proper nouns like "Edward Jenner" and "Immunology," but the general terms like "Father" and "vaccine" do not need capitalization unless they are part of a title or a specific name.