Final answer:
Net income or loss is the difference between total revenue and total cost for a business. The correct definition is net sales minus cost of goods sold.
Step-by-step explanation:
The net income or loss is the difference between total revenue and total cost for a business. It is also known as the profit or loss.
In option a, gross profit plus operating expenses and taxes is not an accurate definition of net income.
Option b, operating expenses minus taxes, is also incorrect. This does not account for revenue and other expenses.
The correct definition is option c, net sales minus cost of goods sold. Net sales represent the revenue from sales, and cost of goods sold represents the direct expenses associated with producing those goods for sale.