What defines a proper steering wheel?

A proper steering wheel is defined as one that is the correct size for the vehicle and free of defects. The appropriate size ensures that the driver can easily and comfortably grip the wheel, facilitating better control and maneuverability of the vehicle. Additionally, a steering wheel that is free of defects, such as cracks, missing parts, or significant wear, is crucial for safety, as any damage could impede a driver's ability to steer effectively.

Having the correct dimensions and maintaining the integrity of the steering wheel directly correlate to the overall performance and safety of the vehicle, enhancing the driver's ability to steer accurately and respond to road conditions. This makes option C the correct choice for defining a proper steering wheel. Other options, such as being oversized, having a stock design, or being leather-wrapped, do not account for the critical aspects of size and condition, which are essential for vehicle operation and safety.