What should you do if you encounter a flashing yellow arrow traffic signal?
Answer: A — Yield and turn with caution.
A flashing yellow arrow traffic signal means that you should proceed with caution while turning. Option B is incorrect because coming to a complete stop is not necessary unless directed by a police officer or road sign. Option C is incorrect because you should reduce your speed to safely turn. Option D is incorrect because you should never speed up while turning, especially when the signal is flashing.