If referring to Of Mice and Men then it would be classified as a novella.
The most probable and most likely answer to this problem would be C. revealed much about their behavior.
Out of the four options presented in this problem, C. would only need a complete subject to make it a correct sentence. Options A. by closely watching and gathering data and B. to terrifying effect would probably need other more words and/or phrases to make them more complete. D. insect studies, on the other hand, can also be considered as a correct option IF insect become the subject.
“To His Coy Mistress” is actually a poem that was written by Andrew Marvell, an author and a politician as well. This poem is spoken by a nameless man and dedicates this poem to a nameless woman as well. Therefore, I can say that the word that best describes the tone of this poem is longing. It would be the last option. Hope this helps.
