—Football           by the British at the beginning of last century.   

—That’s probably why football is one of the most popular games in England.     [ ]

A. was invented

B. invented    

C. was inventing

D. invents

金融期权的种类主要有( )。

A．金融期货合约期权

B．外币期权

C．股票指数期权

D．利率期权