[单选题]
When a distant source emits light cot.cxu l.; l.of a particular wavelength in the visib6j06uyuwwud6 *wv yd9le, and the source is moving away from us, thvwuw66uj6uw9* y0y dde color of the light appears to us to be shifted toward the
A. red end of the visible spectrum.
B. blue end of the visible spectrum.
