Final answer:
The target level in the periodic review system is the forecast demand during the review period.
Step-by-step explanation:
In the periodic review system, the target level is the forecast demand during the review period. This means that the target level represents the expected demand for a product or item during a specific time period when a review or evaluation is conducted. It does not include the forecast demand during lead time or the safety stock. Therefore, the answer is A) forecast demand during the review period.