Option 1: Both A and R are individually true and R is the correct explanation of A.

This option suggests that both the assertion (A) and the reason (R) are true, and the reason correctly explains why the assertion is true. In this case, the assertion states that the Narmada and Tapti rivers do not form deltas, and the reason given is that these rivers form estuaries. However, this is incorrect. While the assertion is true, the reason provided is not the correct explanation for it.

Option 2: Both A and R are individually true but R is not the correct explanation of A.

This option correctly identifies that both the assertion and the reason are true. The assertion states that the Narmada and Tapti rivers do not form deltas, which is true. The reason given is that these rivers form estuaries, but this is not the correct explanation. In reality, the Narmada and Tapti rivers do not form deltas because their flow is insufficient to create the necessary sediment buildup. Therefore, option 2 is the correct answer.

Option 3: A is true but R is false.

This option states that the assertion is true (which it is), but the reason is false. However,