商业银行过去三年总收入为1亿元、-6000万元、2亿元，则采用基本指标法计算的操作风险资本要求为（）亿元。

A.0.12

B.0.225

C.0.15

D.0.2

Although many modifications have been made in it, the game known in the United States as football can be traced directly to the English game of rugby.

A．rules

B．changes

C．demands

D．leagues