Which document must you bring to the DMV to obtain your license with a permit?

Answer: B — Your valid permit.

To obtain a driver's license while holding a permit, it is essential to present your valid permit to the DMV. The permit demonstrates that you have completed the necessary steps to start the learning process and are authorized to drive under specific conditions, often with a licensed driver accompanying you. This document is a critical part of the progression toward obtaining a full driver's license, as it shows you have met initial requirements set forth by the state. Other documents like a birth certificate, proof of enrollment in driver education, or a social security card may be important for identity verification or to meet additional requirements. However, the valid permit is specifically required at this stage because it signifies that you are actively participating in the driver's education process and are ready to advance to the next level, which is obtaining your full driver’s license.