Which arrow represents the force of gravity acting upon the car?
Which arrow represents the normal force on the car?
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The normal force acting upon the car is best represented by arrow A. The force of gravity always acts in the downward direction. It is represented by arrow D in the figure. The applied force on the car is represented by arrow C towards right.

Explanation:

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.