Final answer:
The correct answer is c. once a year. Counting every item in stock once a year in a pharmacy is important for inventory management and accuracy.
Step-by-step explanation:
The correct answer is c. once a year.
In a pharmacy, it is crucial to regularly count the items in stock to ensure accuracy and efficiency. By manually counting every item in stock once a year, the inventory can be properly managed and discrepancies can be identified. This helps to prevent stockouts, overstocks, and expired medications.
Counting the items more frequently, such as every month or every two years, may result in unnecessary labor and cost, while counting every six years would not provide accurate and up-to-date inventory information. Therefore, counting stock once a year is the most appropriate option.