When approaching a stop sign, you should:

Answer: C — Stop and wait until traffic clears

When approaching a stop sign, you should stop and wait until traffic clears to avoid any accidents. Option A, proceeding slowly, may not give you enough time to safely stop before the stop sign. Option B, speeding up, is dangerous and can result in a collision. Option D, sounding your horn, is unnecessary and may startle other drivers on the road. It is important to always follow traffic signs and signals to ensure the safety of yourself and others on the road.