For years, scientists have proposed the idea that Mars was once covered by two huge oceans. However, ridges of rock in the northern hemisphere that seem to resemble a shoreline are too hilly to be the edges of an ocean. If it could be shown that something caused an imbalanced portion of the planet’s mass to shift from these ridges of rock toward the equator, where the mass now lies, it is possible that the ridges were once actually smooth.

Which of the following can be inferred from the statements above?

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