One Reason Why B2B Salespeople Spend Considerable Time Qualifying Potential

One reason why B2B salespeople spend considerable time qualifying potential customers is because

A) they want to have absolutely everything in order before approaching a potential customer.
B) it can be costly to prepare and make a presentation to a business customer.
C) too many business buyers at trade shows are really people from competing firms trying to obtain competitive information.
D) independent agents get the best leads; the company sales representatives need to work harder.
E) all of these.