As the volume of the container increases the pressure inside will decrease because the atoms have more room to move around in.
As the greater force of tension (by 81N) is exerted by the team on the right the rope will move to the right.
A. Food chain
A food web also shows the flow of energy and materials through an ecosystem but in a complex web, not a single chain. A biogeochemical cycle does not deal with the flow of energy/materials through an ecosystem at all.
D. Is repelled by a magnet