Correct Option: D

The months of October-November mark a period of transition from hot rainy season to cold dry winter conditions. This period is known as Retreating Monsoon or Transition season because the southwest monsoons weaken and withdraw or retreat from India. The retreat of monsoon is marked by clear skies and rise in temperature. While days are warm, nights are cool and pleasant. Owing to high temperature and high humidity, weather becomes oppressive. This phenomenon is known as ‘October heat.