Answer:
D. Two movies
Step-by-step explanation:
The cost of opportunity is the price of choosing some choices over other choices.
It is the advantage that compromises picking the best choice among the choices available.
In the question, it is given that you could read two books or see four movies.
So, the opportunity cost of choosing to read one book would be two movies
As two books = four movies
So, automatically one book = two movies