Which of the following italicized parts is used as an object？A．To do this would be to cut

Which of the following italicized parts is used as an object？

A．To do this would be to cut the foot to fit the shoe.

B．He made it a rule to speak English in class.

C．It made us very angry to hear him talk like that.

D．This will be a good opportunity to exchange experience.

请帮忙给出正确答案和分析，谢谢！