Be honest here.

Answer why you applied for this job in the first place? Did the industry’s reputation attract you? Or the high-paying jobs in Digital Marketing industry? Talk about the potential that you see in Digital Marketing in both near and long-term future. This would also help you showcase that you’re well read and updated about your chosen field.

By asking this question, the interviewer wants to know your commitment to the industry and see what makes you the best pick among all the candidates available. Therefore, it is important that you show full commitment and enthusiasm for the industry.