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Expression : $$p^3 - q^3 = ( p - q ) [ ( p + q )^2 - x p q ]$$
=> $$(p-q)(p^2+q^2+pq)=(p-q)[(p+q)^2-xpq]$$
=> $$p^2+q^2+pq=p^2+q^2+2pq-xpq$$
=> $$xpq=2pq-pq$$
=> $$xpq=pq$$
=> $$x=1$$
=> Ans - (A)
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