In the context of operant conditioning, which of the following promotions exemplifies the use of a fixed-ratio schedule of reinforcement?
A. A café offers its customers a free beverage with breakfast from 7 a.m. to 9 a.m.
B. A café prints "You are a winner" on one-twelfth of its coffee and tea lids. Customers who receive such lids can redeem them for free beverages or food items from the café.
C. A café provides its customers with cards. Each time a customer purchases a beverage, a hole is punched in his or her card, and when ten such holes are punched, he or she receives a free beverage.
D. A café offers its customers buy-one-get-one offers every Monday.
Answer: C
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