The correct answer is letter C. She is the person whom he had found sleeping in the library.
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A. The musical group whom won the top prize are from my hometown (WRONG) Because of the word 'whom' which supposedly 'who'
</span><span>B. That author is the one who I saw at the bookstore today. (WRONG) Whom instead of who
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D. Against who did you think you would compete in the contest? (WRONG) It should be whom instead of who
C. As a perfect hostess would great a guest
Explanation:
There are many words to describe the condition asked in the question. Some of the words used to describe "to pay close attention to details and ask questions." are meticulous, punctilious, and scrupulous. Thoroughness. is also used for detailed study.