The fine detail of Saturn's rings provides evidence that the planet may be:

A. young

B. millions of years old

C. in a state of growing larger

I believe that it is B

A. young

Explanation:

When Saturn was the only known planet then it was believed that the age of the Saturn's ring is equal to the age of solar system and age of the solar system is 4.6 billion years. When in 1970s and 1980s other short-lived planets were knows then people started to believe that its age is hundreds of millions of years. Further observations of data indicate that the actual life of Saturn's ring has age tens of thousands of years or less. From the above discussion it is clear that Saturn's ring provides the evidence that planet is young.