A Professor, Dissatisfied with a Product He's Purchased, Bad Mouths

Multiple Choice

A professor, dissatisfied with a product he's purchased, bad mouths the product to his class, resulting in decreased market share (since the students believe everything he tells them) . The manufacturer suffers:

A) an internal failure cost.
B) an external failure cost.
C) a prevention cost.
D) an appraisal cost.