The relationship between the marginal utility that David gets from eating ice cream sundaes and the number of ice cream cones he eats per week is as follows:Ice Cream Sundaes 1 2 3456Marginal Utility201612840David receives 3 units of utility from the last dollar spent on each of the other goods he consumes. If ice cream sundaes cost $4 each, how many ice cream sundaes will he consume per month if he maximizes utility?
A: 2
B: 3
C: 4
D: 5