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

B