A state of consumer equilibrium for goods consumed prevails when the

a. marginal utility of all goods is the same for the last dollar spent for each good.

b. marginal utility per dollar’s worth of two goods is the same for the last dollar spent for each good.

c. price of two goods is the same for the last dollar spent for each good.

d. marginal cost per dollar spent on two goods is the same for the last dollar spent for each good.