听力原文：W: How many holidays do you have in the U.S.？
M: Er, I'm not quite sure. I just know some.
W: For example？
M: Mmm..., Mother's Day, National Day, Thanksgiving Day, Christmas Day, New Year's Day, and Valentine's Day.
W: Not bad. When does its National Day come？ And the Valentine's Day？
M: The National Day comes on July 4th and the latter on February 14th.
W: Talking of the National Day, who is the Father of the state？ Benjamin Franklin or George Washington？
M: George Washington, of course.
W: Besides Washington, who else is regarded as a great president？
M: Abraham Lincoln, I'm one hundred per cent sure.
What were the two speakers talking about？

A. They were talking about the US holidays and so on.
B. They were talking about the US language and so on.
C. They were talking about the US presidents and so on.