As you saw in Part A, Io's elliptical orbit is necessary to its tidal heating. This elliptical orbit, in turn, is a result of the orbital resonance among Io, Europa, and Ganymede. This orbital resonance causes Io to have a more elliptical orbit than it would otherwise, because __________.
a. Europa and Ganymede are unusually large moons
b. all three moons orbit with the same period, staying aligned at all times
c. Europa and Ganymede always pull on Io from the same direction as Jupiter pulls on Io
d. Io, Europa and Ganymede periodically return to the same orbital positions, creating the same gravitational tugs
Ans: D. Io, Europa and Ganymede periodically return to the same orbital positions, creating the same gravitational tugs
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