The drug maker Pfizer enjoyed a monopoly of the antibiotic Lipitor because of patent rights

Consumer surplus is equal to

A) marginal benefit minus price summed over the quantity consumed. B) price minus marginal benefit summed over the quantity consumed. C) marginal benefit summed over the quantity consumed. D) price multiplied by the quantity consumed. E) marginal benefit plus price summed over the quantity consumed.

Define “consumer surplus.”

Please provide the best answer for the statement.