Which of the Following Is Considered an Externality

Which of the following is considered an externality?

A) High-priced tickets to a Broadway show
B) The long wait before being seated at popular restaurants
C) The extra cost of gasoline, regular tune-ups, and so forth, that come with buying a car
D) The benefits gained by society as a result of a more literate populace
E) The opportunity costs of going to college full-time instead of working