题目：若随机变量X服从二项分布B(n, p)，且E(X) = 10，D(X) = 8，则n和p的值分别为A. n = 5, p = 0.4 B. n = 10, p = 0.2 C. n = 25, p = 0.4 D. n = 20, p = 0.5
