Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). **Assertion (A):** Roots exhibit positive gravitropism, whereas shoots exhibit negative gravitropism. **Reason (R):** High concentration of auxin stimulates cell elongation in roots but inhibits cell elongation in shoots. 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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