Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). **Assertion (A):** The Teesta River, which was once a tributary of the Ganga, changed its course and now flows into the Brahmaputra. **Reason (R):** The devastating floods of 1787 and subsequent tectonic movements in the Bengal Basin diverted the course of the Teesta eastward. Select the correct answer using the codes given below:

Options:

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

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