Correct Answer: C

Rationale: The passage indicates that the writer is a student writing a first draft of a paper. The language used in the passage is informal and lacks precision, suggesting it is not written by a professional in a business environment or a researcher for a scientific journal. The focus on experimenting with hitting a golf ball also aligns more with a student exploring a topic rather than an established author of literature.

Correct Answer: A

Rationale: The correct answer is A: 'Performed by one person.' 'Unilateral' means something done by one person or group without the agreement of another. Choice B is incorrect as it suggests the opposite of what 'unilateral' means. Choice C is incorrect as it does not capture the essence of 'unilateral.' Choice D is incorrect as it is not directly related to the definition of 'unilateral.'

Correct Answer: A

Rationale: The correct contraction to use in this sentence is 'who's,' which is short for 'who is.' In the given context, 'who's' indicates the correct possessive form, clarifying that the clients are confused about who is in charge. Choice B, 'Whos,' is incorrect as it does not use an apostrophe to indicate the omitted letter. Choice C, 'Who'll,' is incorrect as it is a contraction for 'who will,' which does not fit the context of the sentence. Choice D, 'Who,' is incorrect as it is not a contraction and does not clarify the intended meaning of the sentence.

Correct Answer: C

Rationale: Choice C is the correct answer. The sentence is punctuated correctly with commas separating the city, state, and the rest of the sentence. In Choice A, there should be a comma after 'California' to correctly separate the city and state. Choice B lacks a comma after 'California,' creating a run-on sentence. Choice D incorrectly uses a comma before the year '2011,' which disrupts the flow of the sentence.

Correct Answer: D

Rationale: The correct answer is 'consequently.' In this sentence, 'consequently' is used to show the result of their late arrival, leading to them missing the wedding. 'Although' (choice A) is incorrect because it suggests a contrast rather than a cause-effect relationship. 'Conversely' (choice B) is also incorrect as it indicates a contrasting idea. 'Unless' (choice C) introduces a condition, which doesn't fit the context of the sentence. Therefore, 'consequently' best connects the delay to missing the wedding.