Which statement best explains why jack stands are used with a lifted vehicle?

• A. To prevent the vehicle from rolling away
• B. To support the vehicle safely and prevent collapse
• C. To check the engine oil level
• D. To unlock the steering column

Answer: (B)

When a vehicle is lifted for maintenance, the crucial point is to have stable support so the vehicle won’t fall. A hydraulic jack can fail or shift, and the load isn’t evenly supported, so you transfer the weight to jack stands placed under solid structural points. This provides a secure, fixed support that prevents collapse, allowing you to work underneath safely. The other ideas don't address this safety need: preventing rolling away is typically done with wheel chocks and brakes, checking engine oil level isn’t related to lifting, and unlocking the steering column isn’t relevant to why you use stands. So, providing safe support and preventing collapse is the correct explanation.