"If You Hadn't Gone to Dinner with Your Friends,you Would

"If you hadn't gone to dinner with your friends,you would have stayed home and surfed the Internet." It follows that

A) surfing the Internet is the opportunity cost of having dinner with your friends.
B) the price of having dinner with your friends is more than the price you would have had to pay to surf the Internet.
C) the opportunity cost of having dinner with your friends is lower than the opportunity cost of surfing the Internet.
D) it is less costly to surf the Internet than to have dinner with your friends.