Answer:
B. salespeople cannot read a buyer's mind
Step-by-step explanation:
Since in the question it is mentioned that the prospective buyer or the buyer who wants to purchased considerd that information which is presented by the seller that called as a black box as the sales people is not able to read the purchaser mind as they are also a human and they dont know what actually the buyer wants until the buyer didnt tell them about their need
Therefore, the correct option is B.