Sautéed,a Restaurant in California,specializes in Sautéed Food

Sautéed,a restaurant in California,specializes in sautéed food.The restaurant holds a highly popular bash,featuring well-known DJs,on the last Saturday night of every month.The restaurant offers event-passes to frequent customers (who must have been billed at least $3,000 during the current month) for free.A limited number of passes are available to other customers at a high price one day prior to the event.Which principle of influence is the restaurant using?

A) liking
B) authority
C) scarcity
D) consistency
E) reciprocation