To lawfully carry a concealed firearm in Oklahoma, an individual must:

To lawfully carry a concealed firearm in Oklahoma, an individual must complete a firearms safety and training course. This requirement ensures that individuals are properly trained and knowledgeable about how to safely handle and use a firearm. Option B, being at least 25 years old, is not correct as the minimum age to apply for a concealed carry permit in Oklahoma is 21 years old. Option C, owning a firearm for at least one year, is not correct as there is no such requirement in the state of Oklahoma. Option D, having no training but being a state resident, is also not correct as completing a training course is a necessary requirement in order to obtain a concealed carry permit in Oklahoma.