Answer:
C; Organize the supplies into stacks of 10, so she can quickly count stacks of supplies instead of having to count single units.
Step-by-step explanation:
The other three options would only increase the amount of time it takes Josie to take inventory of the supply closet. If she organized them into stacks of 10, then she could simply count the stacks and multiply them by 10 to get single units worth of inventory. Hope this helped :)