Which Correctly Describes the Size and Thickness Variation in Pyroclastics

Multiple Choice

Which correctly describes the size and thickness variation in pyroclastics relative to the composite cone they came from?

A) Size decreases, but deposits thicken downslope and then thin with distance.
B) Size increases, and the deposits get thicker away from the vent.
C) Size and thickness both decrease uniformly away from the central vent.
D) Size increases then decreases with distance, but deposits are the same thickness.