The Source of Excess Heat Emitted by Jupiter, Above That

The source of excess heat emitted by Jupiter, above that which is absorbed as sunlight and reemitted, is thought to be:

A) heat generated in the interior by the same electrical currents that generate the planet's magnetic field.
B) heat caused by friction between oppositely directed winds at mid-latitudes.
C) gravitational potential energy released as heat during its formation stages, still being released.
D) chemical reactions between methane, ammonia, and water in the planet's atmosphere and clouds.