Which of the following vehicles is least likely to be converted to use CNG?

Answer: A — Sports cars

Sports cars are least likely to be converted to use compressed natural gas (CNG) primarily due to their design and intended performance goals. Sports cars are engineered for speed, agility, and high-performance dynamics, often prioritizing characteristics such as lightweight construction and powerful engines that run on high-octane gasoline or other specialized fuels. Converting a sports car to run on CNG may not align with the vehicle's performance requirements, as CNG typically has a lower energy density compared to gasoline, which can compromise speed and acceleration. Furthermore, the space and weight considerations for CNG fuel tanks can negatively impact the car’s design and handling. In contrast, standard sedans, delivery trucks, and large buses are often used for practical purposes rather than peak performance, making them more suitable candidates for CNG conversion due to their higher utility focus and the ability to accommodate CNG fuel systems without impacting performance as severely.