Linda sees a sign on a farmer's fence that reads: HELP ME PICK STRAWBERRIES. FOR EVERY 5 QUARTS YOU PICK, KEEP ONE FOR YOURSELF

If Linda decides to pick strawberries for this farmer, she would be under a _______ schedule of reinforcement.
a) fixed-interval
b) fixed-ratio
c) variable-interval
d) variable-ratio

ANS: B, A fixed-ratio schedule demands a set number of responses, in this case 5 quarts of berries.