La Piere (1934) Observed That Restaurants in the United States

La Piere (1934) observed that restaurants in the United States often claimed that they would not serve Chinese patrons, but in reality many of the same restaurants did. He argued that this demonstrated:

A) that attitudes and behaviour are never related
B) the principle of balance
C) that attitudes are learned
D) that behaviour and attitudes are often inconsistent
E) the principle of cognitive dissonance