Final answer:
Technicians should use the pressure specified on the radiator cap when pressurizing a cooling system to avoid damage and effectively test for leaks.
Step-by-step explanation:
When a technician is pressurizing a cooling system, the correct amount of pressure that should be applied is the amount found on the radiator cap (Option B). This pressure is specified by the vehicle manufacturer and is designed to maintain the integrity of the cooling system while preventing leaks and optimizing performance. Applying too much pressure can damage the system, while too little pressure may not be sufficient to test for leaks effectively.