The statement that best explains the results is:
a. The horseshoes have the same mass, but Drew threw with more force than Blake.
This is because Drew's horseshoe landed past the target, indicating that he must have exerted more force in his throw than Blake, whose horseshoe only landed three-fourths of the way to the target. The mass of the horseshoes is likely to be the same in this scenario since they are both standard horseshoes used in the game.