How do you sell more walnuts in a perfectly competitive market?
if the equilibrium price in a perfectly competitive market for walnuts
is $4.99 per pound, then an individual firm in this market can

a. not sell additional walnuts unless the firm lowers its price.
b. not sell additional walnuts at any price because the market is at equilibrium.
c. sell an additional pound of walnuts at $4.99.
d. sell more only by increasing its advertising budget.
the subject is economics.