A Rational Seller Will Sell Another Unit If

A rational seller will sell another unit if:

A) the profit earned from the sale of the next unit is greater than the profit earned on the sale of the last unit.
B) the cost of making the next unit is less than the revenue gained by selling the next unit.
C) the quantity demanded of the seller's output is greater than zero.
D) the price that could be charged is greater than the equilibrium price.