Answer:
C. Private jets to people.
Step-by-step explanation:
Personal selling refers to a strategy in which the sales people meet with the customer to convince him/her to buy the product. This strategy is used when the goods of services are costly or technical. According to this, the answer is that a manufacturer that sells private jets to people is most likely to employ personal selling because it is an specialized and costly product that requires to meet the customer to be able to explain everything and encourage him/her to make the purchase.
The other options are not right because they are cheaper products and don't require the sales people to meet with the customer to be able to sell them.