Answer: c. Technically complex
Step-by-step explanation:
The Technically complex factor of marketing speaks to the companies that make complicated products. In marketing to the clients of such companies, it is important that the marketers know the specifications of the products so as to explain it to the clients who are usually already quite knowledgeable in the area.
If engaging in Personal Selling as Otis Elevator Sales marketers do, they would need be very knowledgeable in the field in trying to convince clients as well as ascertain client needs. This is where the Technically complex factor comes into play.