设命题 $p:\exists n\in N,n^2>2^n$，则 $\neg p$为（  ）

A．	$\forall n\in N,n^2>2^n$	B．	$\exists n\in N,n^2\le 2^n$
C．	$\forall n\in N,n^2\le 2^n$	D．	$\exists n\in N,n^2=2^n$