less than 和fewer than区别用法
He inveted （）10 people for his birthday party,but to his surprise,over 30 people came.
A.more than B.at least C.fewer than D.at last(个人认为选C,但是和课本上的一个句子矛盾了)
课本句:It has (less than)600 people.
能否请从事英文方面的人帮忙解答下,因为这和语法矛盾了,需要平时讲英文的人说明.
恳求!