The best explanation for the results in this scenario is:
D. The horseshoes have the same mass, but Peter threw with more force than Ben.
This is because Ben's horseshoe landed three-fourths of the way to the target, indicating he may have thrown with moderate force, while Peter's horseshoe landed past the target, suggesting he threw it with greater force. The mass of the horseshoes being the same allows us to focus on the difference in force applied during the throws.