When overtaking and passing another vehicle on a two-lane road, you should pass only to:

Passing another vehicle on a two-lane road should always be done to the left of the vehicle. This is a standard traffic rule designed to ensure the safety of all road users. The primary reason for this rule is visibility; when you pass on the left, you have a clearer view of oncoming traffic and other potential hazards. It also maintains a consistent flow of traffic and reduces the chances of collisions, as most vehicles are designed with the driver seated on the left side, providing better visibility for left-side maneuvers.

Passing on the right can lead to dangerous situations, as many drivers do not expect other vehicles to be overtaking them in that manner. Moreover, options suggesting passing on either side without regard to traffic conditions can be misleading and risky; it is crucial to adhere to established traffic regulations to ensure safety. The option to pass only within a designated passing lane further emphasizes the importance of using marked lanes to safely facilitate traffic flow and minimize accidents.