Backing up your vehicle is: a. not dangerous if you have a b. always dangerous c. only dangerous in large vehicles

B. Always dangerous.

Explanation:

For backing up, it is necessary to look behind you to have a full picture of what is behind the car apart from guiding oneself with the mirrors. This a dangerous maneuver since it is hard to control the vehicle when reversing, so, it is important to perform the action at slow speeds, controlling both the accelerator and brake pedals.

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i think it is the third one.