Question

Personal selling can be very effective in complex selling situations because it involves​ ________ interactions and engagement between salespeople and individual customers.

Answer 1

It can be very effective because it involved interpersonal interactions.
interpersonal interactions on business context refers to a communication between employees and customers that revolved around understanding customer's situation/point of view. Buy understanding this, the sales person could formulate a right move/strategy to match the customers with the most suitable company's product