Which planet is most likely to have a thick atmosphere?

The four outer planets because the sun's radiation thins the atmosphere. The four inner planets have lost some of their atmospheres due to being so close to the sun.

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

Answerwill have thinner; have thicker oceanic sediments;