单项选择题

Questions 11-14 are based on the following conversation. You now have 20 seconds to read the questions 11-14. Why did the man’s children buy the pen

A.It’s a present for the man’s birthday.
B.It’s a birthday present for the man’s wife.
C.It’s a birthday present for the man’s son.
D.It’s a birthday present for the man’s daughter.