A vehicle can be safely supported with ________.

To ensure a vehicle is safely supported, it is essential to utilize equipment designed for that specific purpose. A bumper jack, while commonly used for lifting vehicles, does not provide sufficient stability on its own for long-term support. Blocks can be used to support a vehicle, but they must be utilized in conjunction with a primary lifting device to ensure safety.

None of the suggested materials alone, or in combination from the provided options, meet the criteria for safe vehicle support. It’s crucial to use jacks that are rated for the weight of the vehicle, along with jack stands or ramps that can provide stable support and prevent accidents while working underneath the vehicle. Therefore, none of the choices provide a safe method for supporting a vehicle on their own.