If the zeroes of the polynomial $f(x)=x^3-3px^2+qx-r$ are in A.P,then ______

Question

$\begin{array}{1 1}(A) \;2p^3=9pq-27r\\(B)\;2p^3=pq+r\\(C)\;p^3=pq-r\\(D)\;\text{None of these}\end{array}$