What does a signal person primarily use to direct movements?

A signal person primarily uses hand signals, vocal commands, or visual aids to direct movements. This method is crucial for ensuring clear communication between the operator and the signal person, particularly in noisy environments where verbal instruction might not be heard or understood. Hand signals are standardized and widely recognized, allowing for quick and effective communication. Additionally, vocal commands can provide immediate guidance during operations, while visual aids, such as flags or lights, can further enhance understanding and safety during complex maneuvers.

The reliance on these methods highlights the importance of maintaining clear and reliable communication in construction and lifting operations, which is essential for safety and coordination. This is why option B is the most appropriate response to the question.