The correct answer is: C. Attraction
Gravity is a force that attracts objects with mass. The more mass an object has, the stronger its gravitational pull. Magnetism is a force that attracts or repels objects based on their magnetic properties. Objects with the same magnetic polarity will repel each other, while objects with opposite magnetic polarity will attract each other.
In the same way that gravity attracts objects with mass, magnetism attracts objects with opposite magnetic polarity. This is why magnets can be used to pick up nails and other metal objects.
The other options are incorrect because they do not accurately describe the relationship between gravity and magnetism. Option A, repulsion, is incorrect because gravity does not repel objects. Option B, separation, is incorrect because gravity does not cause objects to separate. Option D, push, is incorrect because gravity does not push objects.
I hope this explanation is helpful! Let me know if you have any other questions.