Answer:
This would be a closed system. Answer, B.
Explanation:
In an isolated system, energy, or heat, can leave or enter the system.
In this scenario, it displays the system as being able to transfer heat throughout the system. Thus, labeling this system as closed.
In a closed system, the matter within the system is constant but, energy is allowed to be transferred from system to surroundings and vice versa. In an isolated system, neither matter nor energy transfer between a system and its surroundings is allowed.
Basically, closed system = energy (as heat in this scenario) can be transferred in and out
isolated system = nothing can transfer in and out
Hope this helps!