Answer: B) the room must be a closed system
Step-by-step explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
As air has high entropy that means , the air particles are very large in number and they are moving randomly. This is possible if the system is closed as otherwise the air must have diffused to regions of lower concentration.
Also entropy increases when the temperature is increased as it increases the kinetic energy of the molecules.