QUESTION $11$

A family has inherited $15,000$ from a long$-$lost aunt. They are weighing up whether to boy a new cer or gpo of a trip to Australia for a month. They decide to go to Australia. The opportunity cost of this decision is

a$)$ the cost of going to Australia.

b$)$ the cost of a buying a new car.

c$)$ the benefits of going to Australia.

d$)$ the benefits of having a new car.