Does the 2017 UPenn essay have to be a narrative, or do we just list activities we'll join?

Here is their supplemental question: How will you explore your intellectual and academic interests at the University of Pennsylvania? Please answer this question given the specific undergraduate school to which you are applying. (400-650 words)

I wrote about what I would be studying, what clubs I would join, and the unique perspective I would bring to Penn. Was this the right way to approach the question? Or was I supposed to write a narrative?