What is the primary use of arms while riding a motorcycle?

Answer: B — To steer the motorcycle

The primary use of arms while riding a motorcycle is to steer the motorcycle. Steering is essential for navigating roads and making turns, which is a fundamental part of riding safely. Proper use of the arms allows the rider to maintain control over the motorcycle's direction and stability. While other options like signaling or maintaining speed are also important aspects of motorcycle operation, they are secondary to the fundamental need to steer the motorcycle. The arms play a crucial role in managing balance and executing maneuvers, ultimately ensuring a safe riding experience. Riding proficiency relies heavily on the rider's ability to control the handlebars effectively, highlighting the significance of this function.