What is the appropriate response if you see a pedestrian crossing at an unmarked intersection?

Yielding to a pedestrian crossing at an unmarked intersection is the appropriate response because it prioritizes the safety of the pedestrian. Pedestrians have the right of way in such situations, regardless of whether the crossing is marked or unmarked. By yielding, you allow them ample time to cross safely, demonstrating both respect for their rights and adherence to traffic laws designed to protect vulnerable users of the road.

Honing in on the context of the other options, alerting a pedestrian with your horn could startle them, potentially leading to confusion or an accident. Speeding up to pass before a pedestrian crosses could be dangerous, as it places the pedestrian at risk, violating traffic regulations regarding the right of way. Lastly, waiting for a pedestrian to signal is not necessary; they should be able to cross without needing to indicate their intention, thus further emphasizing the importance of yielding to them.