What is the main meaning of the Indian monsoon?

Correct answer: Seasonal change in wind direction

The direct answer is Option A: seasonal change in wind direction. The word monsoon refers to a seasonal reversal or change in the direction of winds. In South Asia, land and sea heat differently during different seasons. This creates pressure differences, and winds change direction; the summer monsoon generally brings moist winds from the sea toward land and rain, while winter winds are generally drier and move in the opposite broad pattern. Option A is correct because it gives the central meaning, not merely one result of monsoon. Option B is wrong because winds do not blow in the same direction throughout the year. Option C is wrong because monsoon is not only snowfall; most monsoon discussion concerns seasonal winds and rainfall. Option D is wrong because drying rivers is not the definition and may occur only in particular conditions. Memory cue: monsoon means seasonal winds, especially a seasonal change in direction.