Mud houses are cooler in summer and warmer in winter because ---------

Explanation

Option C is correct. Mud is a bad conductor of heat, meaning it does not transfer heat efficiently. In summer, the mud walls slow the transfer of external heat into the house, keeping it cooler. Similarly, in winter, the mud traps heat inside, maintaining a warmer environment. Why other options are incorrect: Option A is incorrect because mud is not a good conductor of heat; it is an insulator. Option B is incorrect because superconductivity refers to electrical conductivity, not thermal, and mud does not possess such properties. Option D is incorrect as it suggests a process that doesn't happen with mud in terms of heat transfer.