Context: Addison is sitting on a roller coaster cart as it reaches the bottom of a big loop. Earth's gravity is pulling down on Addison with a force of 600N. The seat of the cart is pushing up on Addison with a force of 1,200N.
Assume all other forces on Addison are balanced. Which statement describes the forces on Addison?
A. The forces are balanced, so there is no net force on Addison.
B. The forces are unbalanced, so there is a net force on Addison.
Select the correct answer from the provided options and reply with the letter associated with it.

B