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Outdoor receptacles must be weatherproof in areas that are accessible and subject to moisture exposure because these conditions are essential for ensuring safety and functionality. Weatherproof receptacles are designed to protect against moisture and other environmental factors, which can lead to electrical failures or hazards such as shock or fire.

When installed in locations where they may be directly exposed to rain, snow, or splashing water, these receptacles provide the necessary insulation and protective features against water ingress. This includes features such as gaskets and covers that seal the receptacle and prevent moisture from entering when not in use. Ensuring that outdoor receptacles are weatherproof helps maintain the integrity of the electrical system, reduces the risk of electrical hazards, and complies with safety codes and standards.

Other options do not meet the requirement for outdoor receptacle safety. Areas that are occasionally wet or indoors do not provide the same level of risk for prolonged moisture exposure as areas accessible outdoors. Similarly, areas unlikely to experience rain would not require the same weatherproofing standards, as the potential for moisture damage is significantly lower. Thus, the focus on accessibility and moisture exposure in option B makes it the correct choice for ensuring safety in outdoor electrical installations.