Write the next sentence in the following story.

How to react when your horse rears
Decide whether or not to get off.
When your horse rears, it can be very dangerous. If you are not confident that you will be able to regain control while mounted, get off quickly.

OPTIONS:
a). A horse rears most often on wet jumps. For someone with a compromised ability to keep control, it may be safer to get off on wet jumps..
b). If your horse rears continuously, it could destroy your ability to mount. You may also have emotional conflicts with your horse, and this will also drive her in a dangerous direction..
c). Ride on flat ground, and be sure you do not jump off unless you absolutely have to. During a gallop, make sure your front hooves are firmly in the stirrups and you are relaxed..
d). You can still work him and regain control from the ground before mounting up again. If you don't feel safe, don't take the risk of staying mounted... The answer should be
d).