You have just arrived on the scene of an agricultural business and see three men coming out of a building, choking and holding their heads. One of the men tells you there are two workers still inside. What should you do next?

A. Cover your nose and mouth with a wet towel and check on the status of the two workers inside the building.
B. Evaluate the three men and administer high-concentration oxygen, then help them get a safe distance away from the scene.
C. Call for properly trained assistance and stay a safe distance away from the scene.
D. Enlist the assistance of the men who made it out of the building to conduct a search for the workers inside.