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Which of the following is the empty set?
(A) \( \left\{x / x\right. \) is a real number and \( \left.x^{2}-1=0\right\} \)
(B) \( \left\{x / x\right. \) is a real number and \( \left.x^{2}+1=0\right\} \)
(C) \( \left\{x / x\right. \) is a real number and \( \left.x^{2}-9=0\right\} \)
(D) \( \left\{x / x\right. \) is a real number and \( \left.x^{2}=x+2\right\} \)
\( \mathrm{P} \)
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