设随机变量X的概率分布列为P{X = k} = C(n, k)p(n - k) (k = 0, 1, 2, ..., n)，且E(X) = 3，D(X) = 2，则n和p的值分别为

题目：设随机变量X的概率分布列为P{X = k} = C(n, k)p(n - k) (k = 0, 1, 2, ..., n)，且E(X) = 3，D(X) = 2，则n和p的值分别为
A. n = 3, p = 1/2 B. n = 6, p = 1/2 C. n = 3, p = 2/3 D. n = 6, p = 1/3