若y2(x)是线性非齐次方程y’+ P(x)y=Q(x)的解 y1(x)是对应的齐次方程y’+ P

若y2(x)是线性非齐次方程y’+ P(x)y=Q(x)的解，y1(x)是对应的齐次方程y’+ P(x)y=0的解，则下列函数中哪一个是y’+ P(x)y=Q(x)的解？

A. y=cy1(x)+y2(x) B. y=y1(x)+c2y2(x)

C. y=c[y1(x)+y2(x)] D. y=cy1(x)-y2(x)