Final answer:
Changing the toe setting requires adjusting the tie rod length.
Step-by-step explanation:
The correct answer is d) Tie rod length.
Changing the toe setting in a vehicle involves adjusting the tie rod length. Toe refers to the angle at which the tires point inward or outward when viewed from above. It affects how the vehicle handles and the wear pattern of the tires.
By lengthening or shortening the tie rod, the alignment technician can adjust the toe setting. This is typically done using a special tool that allows for precise measurements and adjustments.