选C
给你几个例句,你可以好好体会what 和how引导的感叹句的区别
what
① What a clever girl she is!
多么聪明的姑娘呀!
② What an interesting story it is!（后接可数名词）
多么有趣的故事呀!
③ What good children they are!
他们是多么好的孩子呀!
④ What beautiful flowers they are!
多么漂亮的花呀!
⑤ What delicious food it is!（后接不可数名词）
多么有味的食物呀!
how
① How cold it is today!
今天多么冷呀!
② How nice the pictures are!
多么漂亮的图画呀!
③ How happy they look!
他们显得多么高兴呀!
④ How well she sings!
她唱得多好呀!
本句如用how
为：how nice the weather is!