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

A