The mechanic used a computer to perform the diagnostic tests. Which of the following sentences most clearly and concisely conveys the same meaning?

Correct Answer: D

Rationale: Choice D correctly conveys that the mechanic used a computer to perform diagnostic tests on the car. It is concise and clear, effectively communicating the main point without unnecessary details. Choices A, B, and C include unnecessary repetition or do not convey the information as clearly as choice D. For instance, choice A adds unnecessary repetition by mentioning 'performing diagnostic tests' twice, while choices B and C introduce additional clauses that make the sentence less concise and direct.

Correct Answer: A

Rationale: The correct sentence is: 'I had seen her before, but yesterday was the first time I saw her indoors.' In this sentence, the correct past participle form of 'see' is used, which is 'seen' in the past perfect tense ('I had seen') and 'saw' in the simple past tense ('I saw'). Choices B, C, and D contain incorrect past participle and past tense forms of the verb 'see,' making them grammatically incorrect. Choice A is the only option that uses the correct past participle 'seen' and the correct simple past tense 'saw.' Therefore, it is the grammatically correct version of the sentence.

Correct Answer: C

Rationale: The correct answer is C, complex. This sentence contains an independent clause ('Bess loves art') and a dependent clause ('who can draw beautifully'). The dependent clause relies on the independent clause for context and cannot stand alone as a complete sentence. The connection between the clauses is established by the relative pronoun 'who.' Choices A, B, and D are incorrect. It is not a compound-complex sentence as it lacks multiple independent clauses and a dependent clause, respectively. It is not a compound sentence since it does not have two independent clauses joined by a coordinating conjunction. Lastly, it is not a simple sentence because it contains both an independent and a dependent clause, making it more complex than a simple sentence.

Correct Answer: A

Rationale: The word 'perturbed' in the sentence conveys a sense of being troubled, disturbed, or bothered by something. Therefore, the most suitable substitution is 'bothered by.' Option A correctly captures the feeling of being unsettled due to the loud noise. Choice B, 'excited about,' does not align with the negative connotation of 'perturbed.' Choice C, 'occupied exclusively with,' introduces a different concept unrelated to feeling troubled by the noise. Choice D, 'confused by,' does not accurately reflect the feeling of being troubled or bothered by the situation described in the sentence. Thus, 'bothered by' is the most appropriate substitution in this context.

Correct Answer: B

Rationale: Option B provides a clear and grammatically correct explanation for why the majority of survivors came from first class - they were able to reach the deck fastest to get a seat on a lifeboat. The phrase 'Because of this' properly introduces the reason that follows. In Option A, a comma after 'Because' is unnecessary and disrupts the flow of the sentence. In Option C, 'Because this' is incomplete and lacks proper connection to the subsequent clause. Option D, similar to Option C, lacks clarity due to the absence of a full linking phrase. Therefore, Option B is the best choice as it conveys the explanation effectively and without grammatical errors.