5 units. The only variable changing is x so it's just 5 units up from the second coordinate
The riddle answer is 24.
A riddle for the number 68 is: 12 more than 14 times 4
Only selections B and D give a maximum height of 13 at t=3. However, both of those functions have the height be -5 at t=0, meaning the ball was served from 5 ft below ground. This does not seem like an appropriate model.
We suspect ...
• the "correct" answers are probably B and D
• whoever wrote the problem wasn't paying attention.