"Business development managers work to expand their company's business, so employers are looking for go-getters who can identify promising opportunities, manage partner relations, and successfully implement partnerships into current business models. In an interview, expect to be quizzed on your analytical, interpersonal, and management skills. You may be asked to evaluate a prospective market or pitch an unorthodox business to the executives of a company."
How to handle customers in a difficult situation.
Be open with our challenges. Not sure they really liked that answer as Q is often very closed when it comes to interfacing with customers. Have a strong "we know what's best" attitude.