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

B