Unlike Tangible Goods, Virtually All Services Are Susceptible to Inconsistency

Unlike tangible goods, virtually all services are susceptible to inconsistency and variations in quality. Why is this so?

A) Because services depend on people for their delivery.
B) Because services cannot be managed due to their intangibility.
C) Because services are extremely time-and-place dependent.
D) Because service marketers cut corners to reduce expenses.
E) Because service marketers make unrealistic promises to customers.