The western coast of India receives heavy rainfall because it is located on the windward side of the Western Ghats. When moist winds from the Arabian Sea come in contact with the Western Ghats, they are forced to rise and cool, which results in the condensation of water vapor and the formation of clouds. This process leads to heavy rainfall along the coastal region.

In contrast, the Deccan Plateau, located on the leeward side of the Western Ghats, receives very little rainfall. The Western Ghats act as a barrier, preventing the moisture-laden winds from reaching the Deccan Plateau. As a result, the plateau does not experience the same level of rainfall as the western coast.

Option 1 is the correct answer as it accurately explains why the Deccan Plateau receives little rainfall. The presence of the Western Ghats blocks the moisture-laden winds, leading to a rain shadow effect on the plateau.

Option 2 is incorrect because it suggests that the region is completely bypassed by the southwest monsoon, which is not the case. The southwest monsoon does reach the Deccan Plateau, but its impact is diminished due to the presence of the Western Ghats.

Option 3 is not completely accurate as the lack of