Concept:The time of day is revealed by the description of the surroundings and the actions of the couple.
Explanation:The passage says the logs “burned themselves out at night.”
It also mentions “cold night air” entering the room.
These details directly show that the events take place at night.
The fire is used to keep the couple warm and to drive away mosquitoes and pests.
That need for warmth and protection also fits a nighttime setting.
No other time of day, such as dawn, sunset, or midday, is suggested by the passage.
Answer:D. night