Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). **Assertion (A):** Lake Baikal contains approximately 20% of the world's unfrozen surface freshwater, despite having a surface area smaller than Lake Superior. **Reason (R):** Lake Baikal is the deepest lake in the world and occupies an active continental rift valley, resulting in an exceptionally deep and voluminous basin. Select the correct answer using the codes given below:

Options:

• A: Both (A) and (R) are true and (R) is the correct explanation of (A).
• B: Both (A) and (R) are true but (R) is not 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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