Two Stars in Earth's Sky Have the Same Apparent Brightness

Multiple Choice

Two stars in Earth's sky have the same apparent brightness. If neither of them is hidden behind gas or dust clouds, then one knows that they

A) must be at the same distance from Earth.
B) may be at different distances, in which case the nearer one must have the greater luminosity.
C) may be at different distances, in which case the farther one must have the greater luminosity.
D) must have the same temperature.