10 19 Quantity Muffins Marginal Utility Grapefruit Marginal Utility 28 80 75 70 72 60 66 Finish 50 62 Time 5 40 56 Refer to the above information to answer this question. If Erica has a budget of $5 and the price of a muffin is $2 and a grapefruit is $1, what will be the total utility of her optimal purchase? O a. 96 utils. O b. 146 utils. O c. 331 utils. O d. 56 utils. O e. 145 utils