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The correct answer is option 4: western disturbance. Western disturbance refers to an extra-tropical storm originating in the Mediterranean region that brings rainfall to northwestern parts of India, including Delhi, during the winter season.
Option 1: South west monsoons are responsible for the majority of rainfall in India during the summer season, not in the winter season. This option is incorrect.
Option 2: North east monsoons are responsible for rainfall in the southern parts of India during the months of October to December. This option is not applicable to Delhi.
Option 3: Conventional rain refers to the rainfall caused by the heating of the land and the resulting convection. This type of rain is not specific to the winter season in Delhi. This option is incorrect.
Therefore, the correct answer is option 4: western disturbance.