In Today's Economy, Personal Selling Has Evolved to Take on Elements

In today's economy, personal selling has evolved to take on elements of customer service and marketing research. Why is this the case?

A) It is less expensive to deliver service and conduct research with the sales staff.
B) It is more time efficient because salespeople are already interacting with customers.
C) Personal selling now focuses more on developing relationships than on generating transactions.
D) It allows salespeople to earn higher commissions for doing more work.
E) None of the above is correct.