[单选题]
When a distant source emits light of a parti*+(bw ch:hup 6a(e ,0prdd lnpcular wavelength in th, j :kea 1ke5qlcr;en.e visible, and the source is moving away from us, the color of the k ke :;rc5elq ne,aj1.light appears to us to be shifted toward the
A. red end of the visible spectrum.
B. blue end of the visible spectrum.