What consists of two yokes with a steel crosspiece joining them together?

The correct choice refers to a universal joint, which is a critical component of many vehicle driveshafts. A universal joint consists of two yokes connected by a crosspiece, often referred to as a cross or trunnion. This design allows for the transfer of torque and rotational motion between two shafts that are not in a straight line or that are at different angles to each other. It effectively accommodates the required movement while maintaining the connection, making it essential in steering and suspension systems as well as in driveshaft assemblies.

In contrast, a spiral cable is designed for steering systems that require a flexible connection for electrical signals, but it does not consist of yokes and a crosspiece. A tilt steering column allows the steering wheel to be adjusted for comfort and positioning but is not built from yokes or crosspieces. A flexible coupling does allow for some misalignment or movement between two components, but it does not feature yokes and a crosspiece arrangement as the universal joint does.