The best way to get good traction on hard packed snow is to:

Answer: A — Carry heavy weights in your trunk

The most effective method for gaining good traction on hard packed snow is to use snow tires. Snow tires are specifically designed with tread patterns that provide better grip in winter conditions, including snow and ice. These tires are made from special rubber compounds that remain flexible in cold temperatures, allowing them to conform better to the road surface and maintain traction. Carrying heavy weights in your trunk can help improve traction to some extent by adding downward force on the tires, but it is not as reliable or effective as using snow tires. While options like lowering tire pressure or adding chains can provide traction benefits, snow tires are the best option overall for driving in snowy conditions.