Final answer:
The slip yoke allows for the driveshaft to lengthen and shorten due to suspension movement.
Step-by-step explanation:
The correct answer is d) Slip yoke.
The slip yoke is a component of the driveshaft that allows it to lengthen and shorten due to suspension movement. It is a splined component that slides in and out of the transmission or transfer case.
For example, when the suspension is compressed, the slip yoke extends, allowing the driveshaft to lengthen and accommodate the movement of the suspension. Conversely, when the suspension is extended, the slip yoke contracts, keeping the driveshaft at the appropriate length.