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已知命题 $p: \exists x \in \mathbf{N}, x^2>3 x-2$ ,则命题 $p$ 的否定为
A. $\forall x \in \mathbf{N}, x^2 \leqslant 3 x-2$     B. $\forall x \in \mathbf{N}, x^2>3 x-2$     C. $\exists x \in \mathbf{N}, x^2 \leqslant 3 x-2$     D. $\exists x \in \mathbf{N}, x^2 < 3 x-2$         
不再提醒