What are the two types of primary cells?

The two types of primary cells are categorized as wet and dry based on their construction and electrolyte type. Wet cells, often referred to as liquid electrolyte cells, contain a liquid electrolyte solution. This kind includes batteries such as lead-acid types commonly used in vehicles. Dry cells, on the other hand, contain a paste or solid electrolyte, which typically allows for greater portability and less spillage risk. A common example of dry cells is alkaline batteries, frequently used in household items.

While other options mention different types or specific chemistries of batteries, they do not categorize the cells in the way the question asks for. For instance, the carbon and lithium options refer to the materials used in batteries but do not classify them as primary cells in relation to their electrolyte states. Alkaline and zinc refer to specific types of batteries, and lead and acid pertain to a specific chemistry used in wet cells. Thus, the distinction of wet versus dry captures the fundamental categorization of primary cells concisely.