Which of the following is a common cause of vehicle breakdowns?

Lack of proper maintenance is indeed a common cause of vehicle breakdowns because regular maintenance is essential for keeping a vehicle in good working condition. This includes activities such as oil changes, checking fluid levels, inspecting tires and brakes, and ensuring that the electrical systems are functioning correctly. Neglecting these essential maintenance tasks can lead to wear and tear on various components, which may result in mechanical failures, leading to breakdowns.

When a vehicle is not maintained properly, it may also fail to operate efficiently, leading drivers to experience issues that can escalate into more significant problems. In contrast, driving on highways, frequent use of air conditioning, and using regular fuel are less likely to be direct contributors to breakdowns compared to the repercussions of inadequate maintenance practices.