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Understand: gravitational forces

Problem

Astronomers are studying a planet with three moons of equal mass. The diagram below shows the locations of the moons at one point in their orbits.
A planet is in the middle of three moons. Moon A is a short distance to the left of the planet. Moon B is a greater distance above the planet. Moon C is an even greater distance below and to the right of the planet.
Which moon is experiencing the weakest gravitational force toward the planet?
Choose 1 answer: