Question

why should you open your door with your right hand when parked on a right - side curb?
so that you will be forced to look behind the car for an approaching bicyclist.
to make sure that you engage the parking brake with your left hand.
to stretch your back and spine in case you had poor sitting posture.
they shouldnt. opening the driver side door with your left hand is the safest.

Explanation:

Opening the car door with the right - hand when parked on a right - side curb forces the driver to turn their body and look behind the car, which helps in spotting an approaching bicyclist and avoiding accidents. The other options about engaging the parking brake, stretching the back, and the claim about left - hand opening being safest are not the main reasons for right - hand door opening in this context.

Answer:

So that you will be forced to look behind the car for an approaching bicyclist.