If a Protostar Were Able to Contract (Get Smaller)without Any

Multiple Choice

If a protostar were able to contract (get smaller) without any change to its surface temperature,what would happen to its luminosity?

A) It would decrease,due to the smaller surface area of the protostar.
B) It would remain the same because the temperature does not change.
C) It is not possible to predict the change in luminosity because other factors are involved.
D) It would increase due to the compression of the gas.