Part A
Mrs. Frank orders the Van Daans to leave the secret annex because:
C. She is furious about what Mr. Van Daan has just been caught doing.
Part B
The quotation from The Diary of Anne Frank, Act II, that best supports the answer to Part A is:
C. Your own son Peter . . . I’ve heard him moan in his sleep, he’s so hungry. And you come in the night and steal food that should go to them . . . to the children!
This statement reflects Mrs. Frank's anger towards Mr. Van Daan for taking food that should be shared among them, highlighting her frustration and the reasons behind her decision.