已知命题 $p$： $\forall x_1,x_2\in R,\left(f\right(x_2)-f(x_1\left)\right)(x_2-x_1)\ge 0$，则 $\neg p$是

A．	$\exists x_1,x_2\in R,\left(f\right(x_2)-f(x_1\left)\right)(x_2-x_1)\le 0$
B．	$\forall x_1,x_2\in R,\left(f\right(x_2)-f(x_1\left)\right)(x_2-x_1)\le 0$
C．	$\exists x_1,x_2\in R,\left(f\right(x_2)-f(x_1\left)\right)(x_2-x_1)<0$
D．	$\forall x_1,x_2\in R,\left(f\right(x_2)-f(x_1\left)\right)(x_2-x_1)<0$