All other things being equal, a company's return on investment (ROI) would generally increase when:

A) average operating assets increase.
B) sales decrease.
C) operating expenses increase.
D) operating expenses decrease.

Operating Expenses

Costs related to the normal operations of a business, excluding costs of goods sold, such as sales and marketing expenses.

Average Operating Assets

The average value of assets used in the production or operations of a company over a specific period, often used in performance metrics like return on investment.

Sales

Sales pertain to the revenue a company generates through the selling of goods or services to its customers.