Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
Hoa and Laura are talking about their volunteer work.
- Hoa: “Thank you very much for helping the disadvantaged children here.”
- Laura: “_______.”
A.That's nice of you!
B.It's our pleasure.
C.Sorry, we don't know.
D.What a pity!