If one of your front tires blows out, the first thing you should do is:

Answer: B — Hold the steering wheel firmly on a straight course

When a front tire blows out, holding the steering wheel firmly on a straight course is crucial for maintaining control of the vehicle. A blowout can cause the car to veer dramatically, and by keeping a steady grip on the wheel, you can counteract any sudden pulling that the vehicle may experience. This remains important until the vehicle is safely brought to a stop. Steering sharply or making aggressive maneuvers during a blowout can lead to loss of control, increasing the risk of an accident. Applying the brakes immediately can also destabilize the vehicle, especially if done abruptly, which could worsen the situation. Signaling for help can be important after you've safely maneuvered the vehicle off the road, but it is not a priority during the immediate response to a blowout. Thus, maintaining a firm grip on the steering wheel while guiding the vehicle straight is the safest approach right after experiencing a tire blowout.