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

This option states that both the assertion and reason are true, and the reason correctly explains the assertion. In this case, the assertion is that sea water is warmer than that of the ocean. The reason provided is that the ocean receives more admixture of water from outside through the ocean currents.

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

This option agrees that both the assertion and reason are true, but it argues that the reason does not correctly explain the assertion. In other words, while the sea water is indeed warmer than the ocean water, it is not specifically because the ocean receives more admixture of water through currents.

Option 3: A is true but R is false.

This option argues that the assertion is true but the reason provided is false. It implies that the sea water is indeed warmer than the ocean, but the reason provided about the admixture of water through currents is not accurate.

Option 4: A is false but R is true.

This option states that the assertion is false but the reason provided is true. It suggests that the sea water is not warmer than the ocean, but the reason about