What is the primary function of a Warning Area?

The primary function of a Warning Area is to signify potential hazards extending from the coast, making the correct answer essential for maintaining safety in and around these areas. Warning Areas are established to alert pilots and operators to situations that could pose risks, such as military training exercises, missile testing, or other activities that might endanger aviation safety. These areas are often located over water but can extend to land, indicating that individuals operating in or near these zones should be aware of potential dangers.

In contrast, while the other choices may involve activities that require caution, they do not encapsulate the primary purpose of a Warning Area. For example, preventing all civilian aircraft traffic does not accurately describe the nature of Warning Areas, as they do not prohibit all traffic but rather advise caution. Similarly, while some Warning Areas may overlap with areas used for paragliding or commercial fishing, their primary intent is not to specifically demarcate these activities. Instead, it's about making pilots aware of potential hazards in the vicinity.