A
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
Which type of force requires contact between two objects for one to push or pull the other?

### Choices:
A. frictional forces slowing down a rolling soccer ball
B. the magnetic force pulling paper clips to a powerful electromagnet
C. the magnetic force pushing two magnets apart
D. the force of gravity acting on raindrops that fall to Earth

### Answer:
