Two stars are the same temperature, but one is twice as large as the other. The larger star is likely dimmer than the smaller star.
Option A
Step-by-step explanation:
The brightness and dimm-ness of a star is dependent upon the reaction of fission of the molecules occurring in the star which releases energy and which establishes the temperature of the star.
in the given scenario, the temperature is constant, but the diameter of the star is different, that means the fission reaction releasing the energy in the larger star is more scattered and in the smaller star is being concentrated. this concentrated gas fusion leads to brightness in smaller and scattered -ness to dimm-ness in larger star.