[单选题]
The appearance of thk8gndlh) kp tn 3ict4+ :jqa,4g9bz5pe 3rpj.yo. * zb:*l .irh squj,mws48lk great range of brightness among 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