If the distance between us and a star is doubled, with everything else remaining the same, the luminosity ...

Question

If the distance between us and a star is doubled, with everything else remaining the same, the luminosity ... 

Answer

 A) is decreased by a factor of four, and the apparent brightness is decreased by a factor of four. 

B) is decreased by a factor of two, and the apparent brightness is decreased by a factor of two. 

C) remains the same, but the apparent brightness is decreased by a factor of two. 

Correct Answer: D) remains the same, but the apparent brightness is decreased by a factor of four. 

E) is decreased by a factor of four, but the apparent brightness remains the same.