“How do you see this job fitting in to your planned career path?
This question gives you an opportunity to show off several positive aspects. A clear answer, with related detail, shows that you actually have a career plan! You’d be surprised at how many people don’t have one.
By showing how the job you want connects with your plan, you also show how much you value the job. Showing motivation is important; every boss wants a worker who will do good work because they want to, not just because they are expected to.