If the Distance Between Us and a Star Is Doubled

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

A) is decreased by a factor of four, and its apparent brightness is decreased by a factor of four.
B) is decreased by a factor of two, and its apparent brightness is decreased by a factor of two.
C) remains the same, but its apparent brightness is decreased by a factor of four.
D) is decreased by a factor of four, but its apparent brightness remains the same.
E) remains the same, but its apparent brightness is decreased by a factor of two.