Why do you want to sell our product/service?
A successful salesperson tends to sincerely believe in the product or service that they are selling. Since as a business development representative you'll be one of the people on the front lines who convinces prospects to try or buy their product, the interviewer wants to know that you'll be able to effectively do this. Tell the interviewer with enthusiasm why you're interested in selling their product/service.
"I am drawn specifically to this role within your company because I have always had a passion for the stock market. I've done my due diligence and know that your company's investment research product is one of the best ones in the industry. I know I will find it easy to persuade other investors to try it because I sincerely believe in the product itself and the benefits it offers. I am a strong and confident salesperson who can sell anything, but I am eager to sell your product in particular because I use it myself and know that other investors will also benefit from it."
Community answers are written by other candidates practicing this set. Reading how others frame the same question is one of the fastest ways to sharpen your own.
Anonymous Answer
Having worked at a law firm in the past, I have personally faced the problem that the company is trying to solve. If I would have had something like this then it would have made work very easy. As a result of this, I believe in the product and I am sure that I will be able to sell it in the market.
Stephanie's Feedback
This is a wonderful start, but I suggest being more specific in your response. For example, instead of stating "the problem the company is trying to solve," state what that problem is. Additionally, sharing a few details about why you believe in the product and how this product would have impacted you personally will make your response more personal and memorable.