Explanation:

Here’s an explanation for the statements and options:

- Statement I

- Isotherms, lines of equal temperature on a map, do bend equatorward over land and poleward over oceans in January in the Northern Hemisphere due to temperature differences.

- Statement II

- The air over oceans is warmer than over land in January in the Northern Hemisphere because of the heat retention capacity of water.

- Option 1

- Correct Answer: Both statements are correct, and Statement II helps explain why isotherms behave as described in Statement I.

- Option 2

- Incorrect, as Statement II does provide an explanation for Statement I.

- Option 3

- Incorrect, because Statement II is correct.

- Option 4

- Incorrect, as both statements are true.