As Part of the Needs Assessment,the Consultative Salesperson Must Know

As part of the needs assessment,the consultative salesperson must know everything about __________.

A) customers and their needs,but not necessarily the product or service
B) the product or service,but not necessarily the competition and potential impact
C) competitors' companies and products,but not necessarily the customers and their needs
D) customers and their needs,the product or service being sold,and the product's competition