Correct Answer: A

Rationale: The complete subject in a sentence includes all the words that describe the main focus of the sentence. In this case, the complete subject is "Sandra's principal reason for choosing the job" as it encompasses all the relevant details about Sandra and her reason for selecting the job. Choice A is the correct answer because it provides the most comprehensive and specific information, making it the complete subject. Choices B, C, and D are incorrect as they do not include all the necessary elements to form the complete subject and do not convey the full context of the sentence.

Correct Answer: C

Rationale: The apostrophe in 'mountain's' is used incorrectly. The word should be 'mountains' without the apostrophe because it is a plural noun, not possessive. The other choices (A, B, D) have the correct usage of punctuation marks and do not contain errors related to punctuation.

Correct Answer: A

Rationale: The prefix 'pre-' typically means before. In this case, 'preoperative' refers to activities that occur before an operation. Therefore, the patient's preoperative evaluation, scheduled for next Wednesday, will take place before the operation. Choices B, C, and D are incorrect because the prefix 'pre-' specifically indicates a time before the operation, not after, during, or outside of it.

Correct Answer: B

Rationale: The misspelled word in the sentence is 'astronemers,' which should be spelled as 'astronomers.' 'Astrophysicists,' 'techniques,' and 'technology' are all correctly spelled words in the sentence. Ensuring proper spelling is essential for effective communication and clarity. The term 'astronomers' refers to individuals who study celestial bodies, including stars, making it the correct answer in this context.

Correct Answer: A

Rationale: The root word 'corp' is related to the body as it comes from the Latin word 'corpus,' meaning body. Words like 'corporal' and 'corporation' are derived from this root, linking them to the body in some manner. Choices B, C, and D are incorrect. 'Auto' relates to self or automatic, 'man' pertains to human or hand, and 'bio' is associated with life or living organisms, none of which directly signify the body.