The weathering process called exfoliation is the natural process that is most likely to cause the rock falls in Yosemite.
As a type of weathering, an exfoliation process refers to a natural process whereby a sheets of rock fracture and get detached from the outcrop due to pressure release.
Hence, the weathering process called exfoliation is the natural process that is most likely to cause the rock falls in Yosemite.
Therefore, the Option B is correct.
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