设随机变量X ~ N(μ, σ^2)，若P(X > a) = 0.3，则P(X < μ - (a - μ)) =

题目：设随机变量X ~ N(μ, σ^2)，若P(X > a) = 0.3，则P(X < μ - (a - μ)) =
A. 0.3 B. 0.4 C. 0.6 D. 0.7