Which of the following is an example of the electrical force?
A. A rollercoaster car remains on the track despite being upside
down.

B. A crate rests on a loading ramp, despite the force of gravity pulling
it down the ramp.

C. A sock sticks to a pair of pants after both are removed from the
clothes dryer.

D. A bar magnet held above metal shavings causes them to move
and clump together.