After they had first agreed to display a 3 inch ""Be a Safe Driver"" sign, California home owners were highly likely to permit the installation of a very large and unattractive ""Drive Carefully"" sign in their front yards. This best illustrates:______.
a. the mere exposure effect.
b. the foot in the door phenomenon.
c. the fundamental attribution error.
d. social facilitation.
e. deindividuation.