Question 1:
The sentence that best explains the meaning of the dealer's statement is:
The dealer is trying to take advantage of Mama by offering her far less than the china set is worth.
Question 2:
The excerpt that best supports the answer in Part A is:
"The man leaped back shouting, 'Hey! Hey, don't do that! Those are valuable dishes!'"
This excerpt indicates that the dealer recognizes the value of the china set, which supports the idea that he is attempting to take advantage of Mama by offering her a much lower price than it is worth.