If you can't avoid riding on a slippery surface, how should you proceed?

Answer: C — Ride as slowly as possible and let your feet skim the surface

When riding on a slippery surface, it is important to proceed with caution. Choosing to ride as slowly as possible and letting your feet skim the surface is the correct approach in this situation. By riding slowly, you reduce the chances of losing control or slipping on the slippery surface. Additionally, having your feet ready to stabilize yourself by skimming the surface can provide extra control and balance. This method allows you to maintain better traction and stability, ultimately reducing the risk of accidents on slippery surfaces. Options A, B, and D are incorrect because they suggest actions that can increase the risk of losing control on a slippery surface. Riding at high speed, quickly braking and accelerating, or leaning heavily on the handlebars can all lead to skidding, loss of traction, and potentially dangerous situations on slippery surfaces.