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While the history of the Earth`s moon is well understood, the origin of the Martian moons, Phobos and Deimos, is still a mystery in spite of numerous space missions sent to Mars. One theory, based on striking similarities between the physical characteristics of the surfaces of Mars` moons and the surfaces of numerous objects in the asteroid belt, is that the Martian moons were formed far away from Mars and then captured by the planet`s gravitational attraction. However, this theory cannot account for the current near-equatorial and near-circular orbits of the moons. The fact that these orbits are consistent with expected orbits of objects accreted around Mars motivated some astrophysicists to propose instead that Phobos and Deimos were formed from a disk of debris in Mars` orbit.

According to the passage, "one theory" is motivated by

A.the degree to which the surfaces of the Martian moons resemble those of objects in the asteroid belt
B.the fact that the origins of the Martian moons are similar to the origin of the Earth's moon
C.the ability of Mars to capture objects from the asteroid belt by its gravitational attraction
D.the lack of alternative explanations of the near-circular shape of the orbits of Mars' moons
E.the difficulty of determining the origins of object accreted around Mars

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