Which detail from this passage of The Diary of Anne Frank best supports the theme that sharing a difficult experience can sometimes strengthen a friendship

the answer is the second one.

i'm pretty sure i had this question the other day and b was the right answer.

it is c because i got it right on my test

sentence lenght varies according to word choice.you select which word to use and that will require to use other expressions that collocate with the word chosen.sentence length will vary   according to the choice of words you make to express your ideas.