Which of the following sentences is INCORRECT？A．He is a child, and must be treated as such

Which of the following sentences is INCORRECT？

A．He is a child, and must be treated as such.

B．One such a grammar book is enough.

C．I hope never to have another such experience.

D．I have never seen such a beautiful building.

请帮忙给出正确答案和分析，谢谢！