In One Classic Study, New York City Residents Cut Their

In one classic study, New York City residents cut their electricity use significantly more when asked in a letter with New York State Public Service Commission letterhead than when the same letter was sent on stationary from Con Edison, the local utility provider. What was the key factor influencing their responses?

A) Amount of information in the letter.
B) Perceived credibility of the sources.
C) Perceived trustworthiness of the sources.
D) Perceived authority of the sources.