What Were the Results of Paul Jesilow's Experiment, in Which

What were the results of Paul Jesilow's experiment, in which he sought services in over 300 auto repair shops in California?

A) Women are more commonly victimized by mechanics.
B) Smaller repair shops are more honest than larger repair shops.
C) Shops located in cities with a high degree of public awareness about repair fraud were more honest.
D) He found that shops often get consumers to sign documents that relieve them of liability.