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The correct answer is option 1, Western disturbances. Western disturbances are a system of low pressure areas that originate from the Mediterranean Sea and move towards the northwestern region of India. These disturbances bring in moisture from the Mediterranean Sea and result in rainfall and snowfall in the northwestern parts of India, particularly during the winter months. They are responsible for the winter rains in this region.
Option 2, Norwesters, refers to thunderstorms that occur during the pre-monsoon season and are associated with the southwest monsoon. They are not related to the Mediterranean Sea.
Option 3, Loo, refers to a strong, hot and dry wind that blows during the summer months in the northern plains of India. It is not associated with the Mediterranean Sea.
Option 4, Mango showers, refers to the pre-monsoon rainfall that occurs in parts of India and is associated with the arrival of the southwest monsoon. It is not related to the Mediterranean Sea.
Therefore, the correct answer is option 1, Western disturbances.