Which of the following reflexive pronouns（反身代词)is used as an object？A．John often put h

Which of the following reflexive pronouns(反身代词)is used as an object？

A．John often put himself forward.

B．Ah, you"re yourself again.

C．He was beside himself with joy.

D．He will solve the problem himself.

请帮忙给出正确答案和分析，谢谢！