How do propeller aircraft typically contribute to transportation?

Propeller aircraft are primarily designed for efficient operation at lower speeds and altitudes, making them especially suitable for short-haul travel. They excel in regional routes and can operate in smaller airports where larger jet aircraft might not have the ability to land due to runway length or facilities. This capability allows propeller aircraft to serve routes that connect smaller towns or regions to larger hubs, effectively supporting regional transportation needs and enhancing overall connectivity.

In contrast, transporting only goods is limited to cargo aircraft, while services to major city airports typically involve jet aircraft that offer higher capacity and speed. Engaging in long-haul international flights is generally not aligned with the operational characteristics of propeller aircraft, as they are less efficient for extended distances compared to jet-powered alternatives. Thus, the contribution of propeller aircraft to transportation is predominantly seen in their support of short-haul travel, making option B the most accurate choice.