Two Main-Sequence Stars Have the Same Temperature

Multiple Choice

Two main-sequence stars have the same temperature. If star A is four times brighter than star B, then:

A) star B is two times farther away than star A
B) star B is four times farther away than star A
C) star B is eight times farther away than star A
D) star B and star A lie at the same distance from us
E) it is impossible to determine their relative distances from the information given