please help, i dont understand, please explain

Question 3 (1 point) "There is no such thing as a free lunch" means: 0 That every choice has an opportunity cost 0 Good quality food isn't cheap 0 You'll have to pay later anyway O That you always have to pay for what you eat Question 4 (1 point) If the short run equilibirum price is such that a typical firm is making positive profits, what will happen in the long run? O More firms will enter, it'll decrease the supply and decrease the price O The firms already in the market will increase the price in order to increase the profits 0 More firms will enter, it'll increase the supply and decrease the price O More firms will enter the market, it'll increase the demand and increase the price