The Lagrangian Method of Optimization Results in a New Variable $\lambda$

Multiple Choice

The Lagrangian method of optimization results in a new variable, $\lambda$ ,called the Lagrangian multiplier,which shows the addition to total utility from an additional unit of income.In other words, $\lambda$ expresses the:

A) the budget constraint.
B) the cost of acquiring an additional util of satisfaction.
C) the marginal utility of income.
D) the optimal level of utility.