Which of the following definitions accurately describes GV Black's Class I?

The definition describing GV Black's Class I cavities accurately highlights that they occur on the occlusal surfaces of posterior teeth, specifically in the pits and fissures. This classification pertains to areas that are more prone to decay due to their morphology, which makes it difficult for cleaning and allows plaque accumulation. These pits and fissures are common features of molars and premolars, hence the distinction as Class I pertains explicitly to problems found in these areas.

Understanding this classification is important for dental assistants when identifying and assisting in the treatment of dental caries. The focus on occlusal surfaces in the proper definition captures the essence of Class I restorations, which are typically addressed with simple cavity preparations and restorations. The other definitions provided do not accurately encapsulate the specific nature of Class I cavities as outlined by GV Black.