Given the task definition and input, reply with output. In this task, you will be shown a conversation and a question. You need to answer the question and choose the correct option based on the conversation. "W" and "M" in the conversations stand for "woman" and "man".

M: Could you tell me how much it is to send a postcard by airmail to Europe? W: Twenty five cents. M: OK, I'd like two 25 cent stamps, please. W: Here you are., Question: What is the man doing? (A) He is buying plane tickets to Europe. (B) He is sending some postcards. (C) He is asking about his mail.
(B) He is sending some postcards.