One rides a horse on its back so girls on horseback, meaning girls on horses backs, are riding the horses; one is only able to ride a horse if that horse has a rider; one cannot happen without the other; therefore girls on horseback expresses the same idea without specifying who is actually on the horse.


Given the statement "A group of girls playing a game on horseback.", is the statement "The horses have riders." is true?
- Yes
- No
- I don't know