Part A
The choice that best answers the question about what causes the most concern for Anne and the others hiding with her is:
A. They are fearful that they will soon be found and captured.
Part B
The quotation from Anne Frank: The Diary of a Young Girl that best supports the answer to Part A is:
B. During the daytime we can’t make any noise that might be heard downstairs, and when someone else is there, like the cleaning lady, we have to be extra careful.
This quotation indicates the constant fear and anxiety about being discovered while they are hiding, thus supporting the concern in Part A.