Answer:
The correct answer is B
Explanation:
The reason is because Io orbits Jupiter on an elliptical orbit as a result of orbital resonances with other satellites.
The orbit resonances is a phenomena whereby one objects orbit period is a simple ratio of another object's period such as 1/2, 5/3, etc. What really happened is that during this period, the two objects line up to each other and the extra-gravitational pull will influence their orbits, and causes tidal friction which is then the source of the tremendous internal heating.