What should you do when you see a yellow triangle sign?

Answer: B — Yield

When you see a yellow triangle sign, it means there is a potential hazard or danger ahead. Therefore, the correct action to take is to yield and exercise caution. Option A, slowing down, is incorrect because it may not be a sufficient response to the identified hazard. Option C, stopping, is incorrect because it may not be necessary or safe to completely stop. Option D, going faster, is incorrect because it goes against the purpose of the yellow triangle sign, which is to warn and advise caution.