In areas where freezing and thawing occur frequently, rocks weather rapidly because of the of freezing water.
a. evaporation
c. leaching
b. expansion
d. oxidation

(B) Expansion

Explanation:

 In the areas where the freezing and the thawing occurred frequently then the water in the freezes and the rock weather occur rapidly. Its due to the expansion in the freezing water as the expansion cracked the rocks from inside. The freeze thaw basically occur when the water seeps into the rocks cracks.

This process is also known as frost wedging. The expansion are occurred when the water molecules are moving and breaking the hydrogen bonds and then it results into the expansion of the water.