Answer:
C could be the moon, and D could be Venus.
Explanation:
Now let's take in consideration that the bar graph represents the distances of the different astronomical bodies relative to the Earth.
You have the following astronomical bodies:
Sun
Moon
Venus
Uranus
Now think about the actual distances of these bodies from Earth.
Among all, the moon is the closest, so this means that the shortest bar would be the moon.
Moon is C.
Again, let's see what else is given. It says that A is the sun, so it is about six times the size of bar C, while Bar D is three times the size of bar C. This makes Bar D the second shortes bar. So among the bodies given, Venus is the next closest. This means that Bar D is venus.