Excessive play in the steering wheel could be caused by which of the following?

Excessive play in the steering wheel is primarily caused by a worn steering rack. The steering rack is a crucial component of the steering system that translates the rotation of the steering wheel into lateral movement of the wheels. Over time, wear and tear can affect the bushings, bearings, and other components within the steering rack, resulting in increased play or looseness in the steering. This play manifests as a noticeable gap between the driver's steering input and the actual movement of the front wheels, leading to a lack of responsiveness when turning the steering wheel.

While other factors like stiff suspension components, faulty wheel alignment, and overinflated tires can influence vehicle handling and performance, they do not directly contribute to the looseness felt in the steering wheel. Stiff suspension can lead to a harsh ride or reduced comfort but does not create steering play. Wheel alignment issues can affect stability and tire wear but are not the cause of loose steering. Overinflated tires may affect handling and traction but wouldn't directly cause play in the steering wheel either. Thus, the condition of the steering rack is the primary concern when diagnosing excessive play in steering.