Option 1: This option states that both statements are individually true and that statement II is the correct explanation of statement I. However, this is not accurate. While both statements can be true, statement II does not provide an explanation for statement I. The two statements discuss different phenomena - El Nino is a temperature rising phenomenon over the Pacific Ocean, while tsunamis are massive ocean waves that become destructive in shallow waters.

Option 2: This is the correct answer. It acknowledges that both statements can be true, but statement II does not explain statement I. They discuss separate phenomena and do not have a cause-effect relationship.

Option 3: This option states that statement I is true, but statement II is false. This is incorrect as statement II is indeed true - tsunamis do move silently in deep ocean waters and become destructive when they reach shallower waters.

Option 4: This option states that statement I is false, but statement II is true. This is also incorrect. Statement I is true - El Nino is a temperature rising phenomenon over the Pacific Ocean and can indeed cause dry monsoon in South Asia.