Solution:The pattern followed here is :
{1st letter + 4 = 2nd letter}, {2nd letter + 4 = 3rd letter} & {3rd letter + 4 = 4th letter}
AEIM → (A + 4 = E), (E + 4 = I) & (I + 4 = M)
RVZD → (R + 4 = V), (V + 4 = Z) & (Z + 4 = D)
CGKO → (C + 4 = G), (E + 4 = K) & (K + 4 = O)
But,
SVZD → (S + 4 = V), (V + 4 ≠ Z) & (Z + 4 = D)
Hence, SVZD is the correct answer.