As a Customer's Product Knowledge Increases, What Typically Happens to the Amount

As a customer's product knowledge increases, what typically happens to the amount of search conducted by the consumer?

A) It will remain the same.
B) It will sharply decrease and then sharply increase.
C) It will decrease, and then increase as the customer becomes more knowledgeable.
D) It will increase, and then decrease as the customer becomes more knowledgeable.