Correct Answer: C

Rationale: The correct plural form of 'cactus' is 'cacti' according to the English language rules for forming plural nouns ending in -us. The word 'cacti' is the plural form of 'cactus,' which follows this particular rule. Choice A 'Tomatoes' is incorrect because the correct plural form of 'tomato' is 'tomatoes,' not 'tomatos.' Choice B 'Analysis' is incorrect as it is already the plural form. Choice D 'Criterion' is incorrect as its plural form is 'criteria,' not 'criterion.'

Correct Answer: A

Rationale: Choice A is the correct answer as the sentence is correctly punctuated using em dashes to set off the list. The em dashes help to clearly separate the list of tools from the rest of the sentence. In Choice B, a colon is used, which is incorrect as colons are typically used to introduce a list, not within the list itself. Choice C lacks any punctuation to separate the list, making it unclear and incorrect. Choice D uses semicolons, which are not appropriate for separating items in a list, making it incorrect as well.

Correct Answer: C

Rationale: The suffix '-fy' means to make or cause to have. Each word listed-glorify, fortify, gentrify, acidify-indicates a process of transforming or altering something, making the common meaning related to causing or making. Choice A ('Marked by, given to') is incorrect as it does not reflect the action of making or causing. Choice B ('Doer, believer') is unrelated to the suffix -fy and does not capture its meaning. Choice D ('Process, state, rank') is also incorrect as it does not align with the consistent theme of causing or making evident in the words provided.

Correct Answer: A

Rationale: The correct answer is A. The sentence correctly uses commas to set off the non-essential clause 'which had been parked on a steep hill.' The use of commas before and after the clause helps to distinguish it as additional information that could be omitted without changing the essential meaning of the sentence. Choices B, C, and D lack appropriate punctuation to set off the non-essential clause, making them incorrect. In these options, the absence of commas or the placement of commas incorrectly within the sentence affects the clarity and structure of the sentence, violating punctuation rules for non-essential clauses.

Correct Answer: C

Rationale: The correct answer is C because there is a tense disagreement in the sentence. The use of 'was' (past tense) and 'she's' (contraction of 'she is' present tense) creates an inconsistency in the verb tense. The sentence should maintain consistency either in past tense ('She was a gifted pianist, although she struggled with the piece for her upcoming concert') or present tense ('She is a gifted pianist, although she's struggling with the piece for her upcoming concert'). Choices A, B, and D are incorrect as the issue in the sentence is related to verb tense disagreement, not transition words, diction, or sentence completeness.