Final answer:
The factor that is not a factor in determining whether a body in the solar system retains an atmosphere is rotation rate.
Step-by-step explanation:
The factor that is not a factor in determining whether a body in the solar system retains an atmosphere is b. rotation rate.
The distance from the Sun is important because it affects the temperature and pressure of the atmosphere. The composition and weight of gases determine the ability of the atmosphere to retain gases. The escape velocity is the minimum speed an object needs to escape the gravitational pull of a planet, so it affects whether a body retains an atmosphere. The axial tilt affects the distribution of sunlight and seasons on a planet.