Which of the following actions can prevent suspension-related problems?

C is the correct choice because performing visual inspections and making timely repairs of the suspension system are crucial for maintaining the integrity and functionality of a vehicle's suspension. Regular inspections allow technicians to identify issues such as worn-out bushings, damaged shock absorbers, or misaligned components before they escalate into more significant problems. Timely repairs can help ensure that the suspension system operates effectively, which contributes to the overall safety and ride quality of the vehicle.

While regular tire rotation is important for tire longevity and promotes even wear, it doesn't directly contribute to preventing suspension-related issues. Frequent oil changes are essential for engine health but do not impact the suspension system. Checking the fuel system is entirely unrelated to suspension problems as it pertains to the engine's performance rather than the vehicle's handling. Thus, routine visual inspections and addressing any necessary repairs are key in preventing suspension-related problems.