Final answer:
The correct option is A) Creeper; A technician uses a creeper to roll under a vehicle supported by jack stands, providing a safe and convenient way to perform under-vehicle repairs.
Step-by-step explanation:
When a vehicle is supported by jack stands, a technician can roll under it on a creeper. A creeper is a flat, wheeled platform that allows a person to lie on their back and move easily underneath a vehicle.
It provides a comfortable and efficient way to access the underside of a vehicle for repairs and inspections. Using a creeper is safer than other options like mats, tarps, or blankets because it is designed specifically for this purpose and typically includes features like a padded headrest and sometimes tool trays for convenience.