Adisadvantage of the fixed-period inventory system is that:

(a) it involves higher ordering costs than the fixed quantity inventory system.
(b) since there is no count of inventory during the review period, a stockout is possible.
(c) additional inventory records are required.
(d) orders usually are for larger quantities. the average inventory level is decreased.

The correct answer is letter "B": since there is no count of inventory during the review period, a stockout is possible.

Explanation:

The fixed-period inventory system, also known as a periodic inventory system, only updates the organization’s inventory balance when an actual physical count of the inventory is necessary. Most companies only carry out a physical inventory count once every quarter or year, being this the reason why this system is called "fixed-period". However, this could lead to a company stockout at an unexpected period when the count was not carried out yet.

definitely a