Which of the following sentences is INCORRECT？A．Three weeks was allowed for making the nec

Which of the following sentences is INCORRECT？

A．Three weeks was allowed for making the necessary preparations.

B．Tom, more than anyone else, is anxious to go there again.

C．Not only the teacher but also his students object to the change.

D．Both bread and butter was sold out in that grocery.

请帮忙给出正确答案和分析，谢谢！