Why Does Saturn Radiate Even More Excess Energy Than Jupiter

Why does Saturn radiate even more excess energy than Jupiter?

A) Saturn is still radiating heat left over from its formation.
B) Saturn's thick cloud layer contributes to a larger Greenhouse Effect.
C) Helium rain gives off heat as it differentiates toward Saturn's center.
D) Saturn's atmosphere contains much methane, creating a large Greenhouse Effect.
E) Saturn can fuse hydrogen into helium in its core, like the Sun.