d. is characterized by a general stagnation of atmospheric circulation.
Explanation:
An air mass is a part of the earth surface where the air can be stagnant and then gradually decline and gradually gain the peoples on the underlying surface and becomes a source region and the main source regions are the high-pressure area in the subtropics and gives rise to the subtropical air mass and the around the poles. It has a stagnant properties of the atmospheric circulation.
Basically, the effect is that Europe could be facing the sun or away from the sun. when its close to the sun its hot. when its far away from the sun its cold.
"1785, Jefferson expressed a belief that slavery corrupted both masters and slaves alike, and that gradual colonization would be preferable to immediate manumission."
