[单选题]
The appearance of the great range of brightness ax9gquv7v x- x4/7i1s3 w7dnmams0 qaqw4 6o:ewp1x ybmong stars 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
