In Terms of Uniformity, Which of the Following Is a Difference

In terms of uniformity, which of the following is a difference between services and goods?

A) Owing to customer non-participation, services are often linear, while goods are non-linear.
B) Services often involve a short-term, impersonal relationship between buyer and seller, while goods often involve a personal, long-term relationship.
C) Because of high involvement on the part of a buyer, services tend to be unique, while goods do not vary in quality.
D) Services can be inventoried uniformly, while goods face stockouts due to their heterogeneous nature.