Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). **Assertion (A):** The ozone layer is concentrated primarily in the stratosphere between 15 and 30 kilometers above the Earth's surface. **Reason (R):** Stratospheric ozone is formed naturally through the interaction of solar ultraviolet (UV) radiation with molecular oxygen (O2). In the context of the above statements, which of the following is correct?

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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