At an uncontrolled intersection with no traffic signals, signs, or police, two vehicles approach from perpendicular roads at the same time: Car A approaches from the north, and Car B approaches from the east (to Car A's right). Who has right-of-way?

1. Car A, because northern traffic always has priority
2. Whichever vehicle is traveling faster
3. Car B, because drivers must yield to vehicles approaching from the right-hand road (让右方来车先行)
4. Whichever vehicle is carrying more passengers