[QA] Hoa and Laura are talking about their volunteer work. Hoa: “Thank you very much for helping the disadvantaged children here.” Laura: “________.” 

Question:

Hoa and Laura are talking about their volunteer work.

Hoa: “Thank you very much for helping the disadvantaged children here.”

Laura: “________.” 

• A.
  What a pity!
• B.
  It’s our pleasure.
• C.
  That’s nice of you!
• D.
  Sorry, we don’t know.