The correct answer is A. Do not stop in traffic; if possible, pull off to the right as far as possible.
When you experience a breakdown on the freeway, it's important to move your vehicle out of traffic to ensure your safety and the safety of other drivers. Pulling to the right side of the road is generally the safest option. While options B, C, and D may contain some useful information, the priority is always to get your vehicle out of traffic.