Which of the following factors can affect the towing capacity of a vehicle?

The towing capacity of a vehicle is primarily determined by the vehicle's weight and engine power. The weight of the vehicle itself plays a significant role in how much additional weight it can safely tow without exceeding its limits. Heavier vehicles generally have more stability and may be designed to handle larger towing loads. Engine power is equally important, as it affects how well the vehicle can accelerate and maintain speed while towing a trailer or load. This involves not only the engine's horsepower but also its torque, which is crucial for moving heavy loads, especially from a standstill.

In contrast, factors such as fuel type, driver's height, and the color of the vehicle have little to no impact on the actual towing capacity. The type of fuel can affect fuel efficiency and engine performance, but it does not change the inherent structural capabilities of the vehicle. Similarly, the driver's height does not influence how much weight a vehicle can tow, nor does the color of the vehicle. These factors are unrelated to the mechanics and specifications that determine towing capacity.