What must you do before making a right turn at a red light?

Answer: B — Come to a complete stop

Before making a right turn at a red light, it is essential to come to a complete stop. This is important for several reasons. Stopping allows you to assess the situation, ensuring that it is safe to make the turn. It gives you time to check for pedestrians who may be crossing or vehicles that are either moving through the intersection or approaching it. Following a complete stop, you can look both ways to determine if the road is clear, which is crucial for preventing accidents and ensuring compliance with traffic laws. It's important to remember that while the light may be red, other traffic may also be present, and performing due diligence by stopping ensures everyone on the road remains safe. Simply signaling your intent or looking for other vehicles without stopping would not provide adequate safety checks, as it could lead to overlooking pedestrians or oncoming traffic. Therefore, a complete stop is a necessary practice before proceeding with caution.