You Measure Cepheid Variables in Galaxy a and Galaxy B

You measure Cepheid variables in galaxy A and galaxy B. Both Cepheids have the same period, but the one in galaxy B appears 16 times brighter than the other. You conclude

A) Galaxy B is 4 times more distant than galaxy A.
B) Galaxy B is 16 times more distant than galaxy A.
C) Galaxy B is 16 × 16 = 256 times more distant that galaxy A.
D) Galaxy A is 16 × 16 = 256 times more distant that galaxy B.
E) Galaxy A is 4 times more distant than galaxy B.