Final answer:
The quarter didn't roll down the hill with the nickel because they have different masses.
Step-by-step explanation:
The reason the quarter didn't roll down the hill with the nickel is because of A) different mass. The quarter and nickel have different masses, which affects how they respond to forces like gravity. Objects with a greater mass, like the quarter, are more resistant to changes in motion and are less likely to roll down a hill compared to objects with a smaller mass, like the nickel.