The same luminosity, comparing star A to star B...?

Question

Two stars have the same luminosity, but star B is three times farther away from us than star A. Compared to star A, star B will look ---

A.nine times brighter
B.nine times fainter
C.just as bright as star A
D.three times brighter
E.three times fainter.

I'm not sure I think it's E

Answer 1

No, the answer is B since the light dims as the square of the distance. Three squared is nine so the star B would look nine times fainter.