Study the production schedule below and answer the question that follows. Food workers 4 3 2 1 0 Output 25 22 17 10 0 Film workers 0 1 2 3 4 Output 0 9 17 24 30 In the table above, the opportunity cost of increasing food output from 17 to 22 is: a) 17 films. b) 9 films. c) 26 films. d) 8 films.