[单选题]
Light arriving at a concave mirror on a path through g dt * g 5zvqdiy0hr-w pj;0p-7;6aacnthe focal +-w9y5 0mvbi zee -e *w7ksawu1psc8ppoint is reflectesp 5ww9*pe0+v -sw-cze7a81ebi yu mkd
A. back parallel to the axis.
B. back on itself.
C. through the focal point.
D. through the center of curvature.
