Why did Sherman choose photography as her art medium for her "Film Stills" series? because painting the subject matter would have taken too long
because the subject matter Sherman was commenting on was also captured by a camera lens
because she didn't have the room to setup her painting supplies
because she liked the hands off approach photography gave her

This sounds like a personal reflection on something you did. it is asking the hardest part, or a part you may have struggled with on an informal interview you must have done. it is also asking advice you'd give someone else for the process of completing an informal interview, so you should write something that would . for example, maybe the first thing they should do, something they should include.