From a Salesperson's Perspective, How Can the True Power of Questioning

From a salesperson's perspective, how can the true power of questioning systems such as SPIN and ADAPT be summarized?

A) By focusing on the consequences of not solving a problem, they increase the buyer's perceived need to solve it and the value of the solution being offered.
B) Both questioning systems provide salespeople with much-needed structure to plan selling interactions.
C) Questioning systems help new salespeople do what veteran salespeople do naturally.
D) Sales managers like questioning systems such as SPIN and ADAPT because they reassure them that the right questions are being asked by their salespeople.