The answer is: B could be the sun, and C could be the moon.
Logically, you can solve for this by considering first the astronomical bodies mentioned .We have the sun, Uranus, Mars, and the moon.
Next is we consider the sizes of the bar graphs. It states there that BAR C is the shortest. So automatically, we can say that BAR C is the moon, because among all the astronomical bodies mentioned in the choices, the moon is the closest body to the Earth.
With that alone, we can say that the 2nd statement would be the only one correct.