Which of the Following Best Matches the Description

Which of the following best matches the description?
-Ability of soil to crumble.

A) weathering
B) parent material
C) friable
D) soil profile
E) humus
F) chemical weathering
G) terrace
H) soil structure
I) terrace.
J) mechanical weathering
K) leaching
L) contour farming
M) loam
N) horizon
O) windbreak
P) soil texture
Q) lithosphere
R) asthenosphere