Some years ago, McDonald's claimed that its Big Mac had "Two all-beef patties, special sauce, lettuce, cheese, pickles, onions, on a sesame seed bun." Today if consumers hear "Two all-beef patties...," they laughingly play the game, completing the entire line of copy. Their participation illustrates the gestalt principle of:
A) recency.
B) closure.
C) exposure.
D) completion.
Answer: B