Answer:
d. Reduce average Inventory
Step-by-step explanation:
Inventory turnover ratio represents how quickly an entity's inventory is converted into sales and cash is generated. 
Inventory turnover in days is computed as;
= 

Inventory turnover ratio can be computed as: 
= 

Average stock = 

wherein, Op stock = Opening stock
Cost of Goods Sold = Sales - Gross Profit
A reduction in the average inventory level would increase the inventory turnover ratio, and thus reduce the inventory conversion period from 80 days to a lower level.