The increasing order of the rate of HCN addition to compounds A-n is $(A)HCHU \qquad (B) CH_2COCH_3 \qquad (C) PhCOcH_3 \qquad (D) PhCOPb$

Question

$\begin{array}{1 1} A < B < C < D \\ D < B < C < A \\ D < C < B < A \\ C < D < B < A \end{array} $