The correct options are
A It is is also known as the transition season.
C Land is moist and atmosphere gets humid.
D Oppressive weather due to high temperature.
The season of retreating monsoon is also known as the transition season as it marks the transition from the hot, wet, and rainy season to dry winter season. The temperatures are high during the day and nights are cool. Due to heavy rainfall between the months of June and September, the land is still moist and hence the atmosphere is humid.