If you are driving on a two-lane highway, when can you pass a car in front of you using the left lane?

Answer: A — When there is a broken yellow line on your side.

In North Carolina, you can pass a car in front of you using the left lane when there is a broken yellow line on your side of the road. A broken yellow line indicates that passing is permitted in that direction on a two-lane highway. The other options are incorrect for various reasons: a broken white line typically indicates that lane changes are allowed within traffic, not specifically for passing, waiting for a mile of no oncoming traffic is not a legal requirement for passing, and passing based on the front driver's signal is not a safe or legal practice.