[单选题]
The appearance of the great range of brightness12i 4co/mxi7s1gt px wai s5p2 among stf2y+gf ck6wbq d/pn 9,ars is due to
A. the differences in the amount of light different stars emit.
B. the differences in the distances of stars from us.
C. both of the given answers
D. none of the given answers
