—Mr. Smith, why are you always asking me to do the difficult work?

—Because you _______ do such a thing and nobody else is fit for it.

A．would

B．should

C．can

D．may

根据《巴黎公约》，对于发明专利的优先权期限为（）。

A.1个月

B.3个月

C.6个月

D.12个月