Multi-select problem: How does the next paragraph end?

How to ski moguls
Use stiff skis with flexible tips.
Stiff skis have a large turning radius and they will help you brake and slow down. The flexible tips aid you in maneuvering around each of the moguls with ease!
Shorter skis will allow you to make tighter turns, but will help out less when you try to slow down.

[a]. Keep your upper body upright and your arms out in front of you. The majority of your body motion will come from keeping your legs relaxed as you ride over each bump.;
[b]. They are less likely to fall off in the snow. Avoid skis with sharp ends or dull tips.;
[c]. Pick a balance disk, if you have one. Balance disks are curved disks sitting horizontally over a round barrel-like base that is really a support disk.;
[d]. You can usually get by with longer, thicker skis, but thinner ones provide a smoother snow. Make sure the ski area is clear.;
[a].