Question

safety belts are designed______. with an emergency locking mechanism to unbuckle automatically to automatically buckle to fit the driver’s body automatically

Explanation:

Safety belts are designed with an emergency locking mechanism. This mechanism locks the belt during sudden stops or collisions to keep the occupant secure. The other options are incorrect: safety belts do not unbuckle automatically, do not automatically buckle (they need to be buckled manually by the user), and while they can be adjusted to fit, they don't fit the driver's body automatically in the way implied (the fitting is often manual adjustment or pre - designed to be adjustable, not an automatic fitting process as described in the option).

Answer:

A. with an emergency locking mechanism