To maintain a parallel flight next to a straight road with side crosswind, what adjustment must be made?

To maintain a parallel flight alongside a straight road in a side crosswind, the pilot must point the aircraft into the wind to offset its effect. This technique is known as crabbing, and it involves aligning the aircraft's nose into the wind so that the aircraft maintains a straight path relative to the ground. The wind pushes the aircraft laterally, so by angling into the wind, the pilot can counteract the drift caused by the crosswind and ensure that the flight path remains parallel to the desired course.

In this scenario, the objective is to maintain both altitude and track, making it essential to continuously adjust the aircraft's heading into the wind. This adjustment does not directly involve changing the speed or using throttle since those actions do not effectively address the drift caused by a crosswind.

The other choices suggest various adjustments that do not directly work to maintain a track parallel to the road. For instance, decreasing throttle does not help with lateral displacement caused by the wind, and increasing speed could result in unwanted altitude changes or increased stability challenges. While using the rudder is a valuable action to maintain direction, in the case of crosswinds, the primary method relies on heading adjustment rather than rudder alone.