Ball bearings are used in cycles, scooters etc to A. Increase the friction between the wheel and the axle B. Reduce the friction between the wheel and the axle C. Reduce the friction between ground and the whee D. None of the above

The correct answer is: B. Reduce the friction between the wheel and the axle

Ball bearings are used in cycles, scooters, etc. to reduce the friction between the wheel and the axle. This allows the wheel to rotate more easily, which makes it easier to ride the cycle or scooter.

Option A is incorrect because ball bearings reduce friction, not increase it.

Option C is incorrect because ball bearings reduce friction between the wheel and

Option D is incorrect because ball bearings are used to reduce friction, not increase it.