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An advertisement for a food delivery subscription service offers a free trial for new customers for the first two weeks of the service. Customers have the option at the end of the trial to continue their subscription or to cancel. The expectation from the service's creators is that people will want to continue subscribing to the service after their free trial is over because of the value it brings to their lives.

What persuasive method does this situation describe?


A, the norm of reciprocity
B, behavior observation
C, the "foot-in-the-door" technique
D, personal experience