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What is the primary reason that astronomers suspect that some jovian moons were captured into their current or?

What is the primary reason that astronomers suspect that some jovian moons were captured into their current orbits? A. Some moons have orbits that are "backwards" (compared to their planet's rotation) or highly inclined to their planet's equator. B. Astronomers have observed moons being captured. C. Some moons are surprisingly large in size. D. Some moons have a composition that differs from the composition of the planets.

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1. A
2. A. Some moons have orbits that are "backwards" (compared to their planet's rotation) or highly inclined to their planet's equator.
3. Retrograde, highly inclined orbits and the fact that several of these moons have lassos around them.