Which of These Consumers Is Involved in an Exchange for a Service

Which of these consumers is involved in an exchange for a service?

A) Parul had to go buy groceries and couldn't join her friends at the theater.
B) Corinne bought popcorn at the movie theater.
C) Jason drove to the movie theater in the car he bought last year.
D) Henri bought a new shirt at the store next to the theater.
E) Natalie purchased her movie ticket online.