Which of the italicized parts is used as an object complement？A．Her mind is becoming unhin

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

A．Her mind is becoming unhinged(精神失常).

B．His words went unbelieved by us.

C．Please keep us informed of the latest news.

D．The playground lay deserted.

请帮忙给出正确答案和分析，谢谢！