What is the safest way to back up with a trailer?

Answer: A — In a straight line

Backing up with a trailer in a straight line is the safest and most effective method. When maneuvering a trailer, maintaining a straight path allows for better control over the vehicle and the trailer's alignment. This minimizes the risk of jackknifing, which occurs when the trailer turns at a sharper angle than the tow vehicle, potentially leading to a loss of control. Backing in a straight line also makes it easier to judge distances and angles, reducing the likelihood of hitting obstacles or curbs. In contrast, high speeds can make it difficult to react to unforeseen circumstances or misalignments, while zigzag patterns and sharp turns introduce complexity that increases the risk of accidents or tipping the trailer. Thus, a straight trajectory is the most manageable and safest approach when backing up a trailer.