Car–Hill–Free body

A car coasts at a constant speed over a circular hill. Which of the free-body diagrams in the figure attached is correct? Explain.

My attempt:
I am thinking B. Since the car is at a constant speed, there’s no acceleration. So there is no additional force acting downwards besides it’s weight.

Which would you choose? Explain please.

Thanks

Attached Images
File Type: jpg car.JPG (11.8 KB)

http://ift.tt/1gOA6r9

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