Select the correct answer.
Jeremy works as a salesperson for a manufacturing business. His primary job is to sell the company’s products. On a typical day at work, he goes from door to door to meet new and existing customers, persuading them to buy these products. Which type of promotion does the manufacturing business carry out through employees such as Jeremy?

A.
sales promotion
B.
advertising
C.
public relations
D.
personal selling
E.
direct marketing