In Which of the Following Situations Would You Expect Downward

In which of the following situations would you expect downward movement of soil water through the profile to be most rapid?

A) uniformly textured sandy loam profile
B) sandy loam in upper layers with a clay band underneath
C) sandy loam in upper layers with a layer of coarse gravel underneath
D) clay texture throughout the profile
E) silt loam in upper layers underlain by a sandy layer