In the following, slow step is
`CH_(3)CHO underset(I)overset(CN^(-))to CH_(3)-underset(H)underset(|)overset(CN)overset(|)(C)-O^(Theta) underset(II)overset(H^+)toCH_(3)-underset(H)underset(|) overset(CN)overset(|)(C)-OH`
A. Only I
B. Only II
C. both (a) and (b)
D. None of these
