Which of the following is considered long range in ballistics?

In the context of ballistics, the term "long range" refers to distances at which firearms and ammunition can consistently deliver accurate and effective shots. The classification of long range typically pertains to distances that exceed standard close-quarters engagements and require a higher level of precision due to the range factors like bullet drop and wind effects.

The correct choice identifies a range of 18 to 36 inches as long range, which aligns with the common understanding of ballistics. At this distance, marksmen often need to consider various environmental factors as well as the inherent ballistic characteristics of the ammunition being used. Distances categorized as long range tend to require specialized shooting techniques and often involve the use of optics to ensure accuracy.

In comparison, other ranges provided in the question are considered to be much closer distances typically associated with short to moderate-range shooting scenarios. For instance, distances under 18 inches do not generally require the same level of ballistic consideration that long range shooting necessitates, making them unsuitable for inclusion in the long range classification.