Different Industries Have Developed Their Own Industry-Specific Software Because

Different industries have developed their own industry-specific software because:

A) it is difficult for salespeople in one industry to transfer to another industry
B) the specialized nature of the products means that sales is a radically different process from one industry to another
C) there is no software product for salespeople that works across industries
D) different industries have different repeated actions as part of their sales processes
E) similar industries have similar needs,but salespeople want proprietary software