Explanation:

Correct Option: (d) Explanation:  Option (d) is correct Supplementary notes: Advection  The transfer of heat through the horizontal movement of air is called advection. The horizontal movement of the air is relatively more important than the vertical movement. In middle latitudes, most of diurnal (day and night) variation in daily weather is caused by advection alone. In tropical regions particularly in northern India during the summer season, local winds called ‘loo’ are the outcome of the advection process.