英语单选的中英文化差异问题When visiting a frind,we don't express ourselve

英语单选的中英文化差异问题
When visiting a frind,we don't express ourselves directly,but it's quite different in western countries.In the USA,which of the following doesn't fit its custom?
A. a:Would you like something to drink?
b:I am not thirty.
B: a:May I get something to drink for you?
b:Yes,please.
C:a:Would you like some more or eggs?
b:No,thanks.I am full.
应该选什么? 谢谢！