Which wind speed measure would contribute to a noticeable impact on the trajectory of a bullet?

The choice of 8-12 mph as the wind speed measure that would contribute to a noticeable impact on the trajectory of a bullet is correct because at this speed, the wind has sufficient force to significantly affect the bullet's path and its stability during flight.

Wind can cause lateral displacement, pushing the bullet off its intended target line, which is particularly critical at longer ranges. At wind speeds between 8-12 mph, the effect increases due to the increased turbulence and force acting on the projectile, making it necessary for shooters to adjust their aim accordingly.

In contrast, wind speeds in the lower ranges, such as 0-3 mph or 3-5 mph, generally do not exert enough force to cause a meaningful drift in the bullet’s path, making them less of a concern for marksmanship. Wind speeds of 5-8 mph start to introduce some noticeable effects, but the impact may still be marginal for precise shooting situations, especially compared to the more pronounced influence seen at the 8-12 mph range.