32. Excuse me. Is this Mr. Browns office? a) Thank you. b) Yes. What I can do for you?

The first person is asking for confirmation about the location (Mr. Brown's office). A polite and appropriate response to being asked if you are in a certain place is to confirm or deny it, or to ask how you can help. Option 'a) Thank you' is a polite response but doesn't answer the question. Option 'b) Yes. What I can do for you?' is a common and polite way to confirm your presence and offer assistance.

Ответ: b) Yes. What I can do for you?