Which would best be explained using Newton's Third Law?

Responses
A A gun moves backward while firing a bullet.A gun moves backward while firing a bullet.
B A bicyclist coasts down from the top of a hill.A bicyclist coasts down from the top of a hill.
C A car stops short and the passenger moves forward.A car stops short and the passenger moves forward.
D A larger engine allows a car to accelerate faster.

A A gun moves backward while firing a bullet.