You Have Driven 500 Miles on a Vacation and Then

You have driven 500 miles on a vacation and then you notice that you are only 25 miles from an attraction you hadn't known about,but would really like to see.In computing the opportunity cost of visiting this attraction you had not planned to visit,you should include

A) both the cost of driving the first 500 and the next 25 miles.
B) the cost of driving the first 500 miles, but not the cost of driving the next 25.
C) the cost of driving the next 25 miles, but not the cost of driving the first 500.
D) neither the cost of driving the first 500 miles nor the cost of driving the next 25 miles.