Answer: A. The force you “experience” is really just normal force. For example at the top of the roller coaster you might feel like you are floating, while at the bottom you might feel you are being pushed down into your seat. This happens because normal force and weight point in opposite directions. Using Newton's second law and working out the math reveals that normal force is the greatest at the bottom of the roller coaster.
Verified by Jason Kuma (Knowlaxy Team)