Answer:
Option C - Friction
Step-by-step explanation:
Inertia would be an invalid option as it is not changing state.
Gravity would be invalid option as it will stay on the ground constantly.
Friction would be a valid option as the friction between the bottom part of the furniture and the floor are being rubbed together .
Air resistance is valid but will not be as strong as the friction
Therefore Option C - Friction will be the primary force that the person has to work against to keep this piece moving .
Hope this helped and have a good day