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The parameter, on which the value of \( \left|\begin{array}{ccc}1 & a & a^{2} \\ \cos (\mathrm{p}-\mathrm{d}) \mathrm{x} & \cos \mathrm{px} & \cos (\mathrm{p}+\mathrm{d}) \mathrm{x} \\ \sin (\mathrm{p}-\mathrm{d}) \mathrm{x} & \sin \mathrm{px} & \sin (\mathrm{p}+\mathrm{d}) \mathrm{x}\end{array}\right| \) depend upon, is
(A) \( a \)
(B) \( \mathrm{p} \)
(C) \( \mathrm{d} \)
(D) \( x \)
(W)
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