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已知集合 $A=\left\{x \mid x^{2}-x-2>0\right\}$ ，则 $C_{R} A=$
A. $\{x \mid-1 < x < 2\}$     B. $\{x \mid-1 \leq x \leq 2\}$     C. $\{x \mid x < -1\} \cup\{x \mid x>2\}$     D. $\{x \mid x \leq-1\} \cup\{x \mid x \geq 2\}$         
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