Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). **Assertion (A):** The lower horizons of Arid soils are dominated by 'kankar' layers, which restrict the downward infiltration of water. **Reason (R):** The calcium content increases downwards in the soil profile due to the downward movement of water and subsequent precipitation of calcium carbonate in arid regions. In the context of the above statements, which of the following is correct?

Options:

• A: Both A and R are true but R is not the correct explanation of A.
• B: Both A and R are true and R is the correct explanation of A.
• C: A is true but R is false.
• D: A is false but R is true.

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