Provide your interviewer with a few examples of companies you would be interested to work for in the future. Explain why these specific companies have piqued your interest, or how they align with your goals professionally. Take the time to research the 'partner with Darden' section of their website and mention their participation in the program if a company you are interested in is a current or past partner of UVA Darden.
In my opinion, the only poor way to answer questions like these is to stop at 'I don't know'. Candidates who fail to elaborate miss an opportunity to help their interviewer get to know them better. Your interviewer may also feel you are lacking vision. If you are unsure where you would like to go next, give your interviewer a sense of the attributes and values you are looking for in a future opportunity.