What should you do if you approach an intersection with a yield sign and there is a pedestrian in the crosswalk?

Answer: A — Stop and wait for the pedestrian to cross completely.

Approaching an intersection with a yield sign means that you do not have the right of way and must yield to any vehicles or pedestrians already in the intersection. Option A is the correct answer, as it follows the law of yielding to pedestrians in a crosswalk. Option B is incorrect because slowing down and still proceeding without stopping may not give the pedestrian enough time to cross safely. Option C is incorrect because honking may startle the pedestrian and could lead to a dangerous situation. Option D is incorrect and illegal because it does not give the pedestrian priority and puts them at risk. Therefore, option A is the safest and most responsible choice in this scenario.