Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore
A) both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A.
B) both stars have the same apparent brightness, but the luminosity of Star B is four times that of Star A.
C) both stars have the same luminosity, but the apparent brightness of Star A is four times that of Star B.
D) both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A.
Answer: D