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

A