Mechanical weathering may occur by means of?

Question

Mechanical weathering may occur by means of

A plant roots
B temperature changes
C frost action
D all of the above
E none of the above

Answer 1

Well cryoturbation is certainly one of them, so is expansion and contraction. Then there is the wedging action of growing roots. By George, must be D.

Answer 2

its D
mechanical weathering is: The process by which a rock or mineral is broken down into smaller fragments without altering its chemical makeup; weathering that affects only physical characteristics.

as long as it isn't rusting or anything like that but is being broken up by physical means it is mechanical weathering