Giving brainlyiest
Which of the following is an example of a difference between planets in the solar system?

(A) A planet can have a surface made of either liquid or gas.

(B) Some planets have thick atmospheres, while others have thin atmospheres.

(C) A planet must have a moon, but it can differ in terms of its size.

(D) All planets have rings, but some are very hard to see with your eyes.