The Intersection of a Firm's Marginal-Revenue and Marginal-Cost Curves Determines

The intersection of a firm's marginal-revenue and marginal-cost curves determines the level of output such that which of the following is the case

A) Profit is maximized where total revenue is equal to variable cost.
B) Profit is maximized where the difference between marginal revenue and marginal cost is the largest.
C) Profit is maximized where total revenue is equal to total cost.
D) Profit is maximized where the difference between total revenue and total cost is the largest.