When can you legally pass another vehicle on the right?

Answer: B — When the vehicle in front is turning left

Passing another vehicle on the right is legal under certain conditions that prioritize safety and ensure that the maneuver is conducted without violating traffic laws. One of the primary scenarios where passing on the right is permissible is when the vehicle in front of you is signaling and preparing to turn left. In this case, it's safe to pass because the left turn creates an opportunity for you to maneuver around the turning vehicle without interfering with oncoming traffic. The other options are valid situations but do not provide safe or legal grounds for passing on the right. For instance, passing a stationary vehicle might not always be safe due to potential obstacles or pedestrians. Similarly, while driving in a parking lot may allow for various movements, it does not inherently permit passing on the right unless specific conditions are met. Lastly, a no-passing sign clearly indicates that it is illegal to pass in that area, regardless of the circumstances. Thus, the scenario of a vehicle turning left offers a clear and legally sanctioned situation to execute a right pass.