Assume that Maria wants to buy tacos and once she finds out that the price per taco is $5, she decides to buy 4 tacos. Which of the following is true? The marginal benefit (or marginal utility) of the 6 th taco is higher than the marginal cost of the 4 th taco The marginal benefit (or marginal utility) of the 4 th taco must be equal to $12 The marginal benefit (or marginal utility) of the 4 th taco must be greater than or equal to $5. The marginal benefit (or marginal utility) of the 2 nd taco must be less than $5