The sentence is:
Your presence at the funeral of your best friend's father is an indispensable consolation for your friend.
It would help if you gave us the sentence to figure out the question.
The repetition of "you" in any sentence would imply that the speaker is talking to a group of people or one person in particular as in yourself.
Im going with the one that say a, if its wrong ill tell you the right answer, bc im currently doing the test rn :)
