The Horse Latitudes (30° North and South Latitudes) and the Doldrums

The horse latitudes (30° north and south latitudes) and the doldrums (approximately 0° latitude) are both noted for regular calms, but they differ in that:

A) air in the doldrums is moving vertically downward while air in the horse latitudes is moving vertically upward.
B) rain is infrequent in the doldrums while it is much more frequent in the horse latitudes.
C) rain is frequent in the doldrums while it is much less frequent in the horse latitudes.
D) the doldrums is a region of high pressure and the horse latitudes have low pressure.