Woman: What a memory I have! I did write down the number on a sheet of paper when I answer

Woman: What a memory I have! I did write down the number on a sheet of paper when I answered the phone this morning. But now the paper has disappeared without any trace. Man: Dont worry. Ill be seeing Mr. Brown in an hour. Question: What do we learn from this conversation？

A．It was probably Mr. Brown"s phone number that the woman wrote down.

B．It was just an hour ago that the man met Mr. Brown.

C．The woman forgot to write down the phone number.

D．The woman needed a sheet of paper to put down the number.

请帮忙给出正确答案和分析，谢谢！