Question

which detail helps you understand how visitors stay warm in ice rooms?
visitors sleep,on a big block.
there are thick coverings on the bed.
there is a heavy mattress on the bed.
visitors sleep for a short time.

Explanation:

Thick coverings provide insulation against the cold of ice rooms, directly helping visitors retain body heat and stay warm. The other options do not address warmth: sleeping on a block would be cold, a heavy mattress does not inherently insulate against ice, and short sleep duration does not help with staying warm during rest.

Answer:

B. There are thick coverings on the bed.