This term refers to the business practice of making exhibitors license films without a preview.

A) block booking
B) vertical integration
C) horizontal integration
D) blind bidding

Blind bidding is the business practice of making exhibitors license films without a preview. The exhibitor would bid on a film based solely on the reputation of the studio or producer, without having seen the actual content of the film. This practice was prevalent in the early days of the film industry and was often used to leverage the power of major studios over smaller exhibitors.