The article says:

In the 1100s, warriors rode horses in circles while tossing a ball back and forth. These fighters weren't just horsing around, however. The point was to improve their horseback riding.
Which words from the passage help you understand the meaning of the word warriors?
A.horsing around
B.back and forth
C.tossing a ball
D.these fighters

The word "fighters" in option D, "these fighters," helps understand the meaning of the word warriors.