What is the left lane on a freeway primarily used for?

Answer: C — Passing

The left lane on a freeway is primarily used for passing other vehicles. It is important to keep the left lane clear for vehicles that are moving at a faster speed to pass those traveling more slowly. This helps maintain a smooth flow of traffic and reduces the potential for congestion and accidents. Remember to move back into the right lane once you have passed the slower vehicle to allow others to pass as well.