What is a good general rule of thumb for knowing when to use who/whom?

Whom is the object form of who . Just like him and he. The object is when something is being done to it and the subject is when it is doing something. for example, he throws the ball. He is literally throwing the ball. But if the sentence were the ball is thrown at him. He is not throwing the ball and you the ball is being thrown. the same thing applies to who and whom. if I say who is the greatest of the all? I am asking who actually is so that is a subject so we use who. But if the sentence were wait you like whom? That is the object form and we whom because we're saying you like a person, they are being liked.

c. would be the answer : )

explanation:

1.   in sonnet 18, the speaker wants to describe the beauty of his love, but can’t find the words to do so. the speaker says “then in mid-utterance the lay was lost” when he tries to think of the words to describe his love’s beauty.   through his defeat of finding words to describe his love, he shows his love for her.

2.   instead of describing how perfect his love is or comparing her to other beautiful things, he says she is average and there is nothing special about her.   at the last 2 lines of the poem, the volta changes the poem by saying that even though his love is average in beauty, his love for her is special and unique. so instead of praising her throughout the whole poem, he contrasts her average characteristics with his special love for her.

3.   the beloved asked the speaker to describe how he feels about her. she begins to describe what she feels but "drop the torch" and says that she can't do it because the words "hid in me out of reach." the the speaker says "nay, let the silence of my womanhood command my woman-love to thy belief" and that her silence will have to be the answer to his question.