Madeleine Allows Herself $100 Per Month for Purchasing Coffee

Multiple Choice

Madeleine allows herself $100 per month for purchasing coffee.The diagram below illustrates the choices available to her in each month. FIGURE 1-3
-Refer to Figure 1-3.If Madeleine chooses to allocate all $100 to buying lattes,we can say that her opportunity cost in one month is

A) zero because she bought what she desired.
B) zero because she stayed within her budget.
C) 80 cups of regular coffee.
D) 40 cups of regular coffee.
E) 20 cups of regular coffee.