Definition: You are given a question on astronomy. Astronomy is a natural science that studies celestial objects and phenomena. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: What is the significance of the 1:2:4 resonance in the Jupiter's moons system?
(A)The resonance pulls Io in different directions and generates heat. (B)It makes the orbit of Io slightly elliptical. (C)It creates a gap with no asteriods between the orbits. (D)It prevents formation of the ring material into other moons.

B