问题详情

设X为随机变量，E(X)＝μ，D(X)＝σ2，则对任意常数C有()．
A．E[(X－C)]2＝E[(x—p)]2
B．E[(X－C)]2≥E[(X－μ)]2
C．E[(X－C)]2＝E(X2)－C2
D．E[(X－C)]2＜E[(X－μ)2]请帮忙给出正确答案和分析，谢谢！