Why Does Weathering of Granite Bedrock Produce Rounded Shapes

Multiple Choice

Why does weathering of granite bedrock produce rounded shapes?

A) The rounded shapes are pillows formed at depth in the granitic magma.
B) Weathering removes corners and edges,as in spheroidal weathering.
C) Burrowing animals eat away parts of the granite.
D) Roots rub against the edges of the granite.