Im no adept expert at this but let me give it a try (Im an intl college applicant and have been going through such kind of things
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It's clear here. You choose one and only one in the list to use as your theme (if you're comprehensive type, choose event. If analytical, choose object. Just my suggestion)
You're expected to tell your story/thought/analysis about the theme/concept you choose (one object, event, activity, or location) and to tell them (story/thought/analysis etc.) through 3 art pieces composed by yourself. Your pieces are not necessarily in drawing, it can be in the form of video, photography, sculpture, 3D work, collage, digital images, etc. You can combine a number of the medium listed in one piece. Your 3 pieces can also be made of 3 different media
Write essays that clarify your ideas, vision, anything that you want Parsons to know about the pieces.
Your work (essay and art piece) should be analytical and personal (The series you create should convey a conceptual and creative response of the subject matter you have chosen to discover.)
They want relationship between essays and art pieces. They expect to see what you've written in the piece you send.
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Just my thought but hope this helps.