Option #1) Define both "interactivity"; a dictionary definition is fine, as is a more eccentric or personal definition. Use that definition to explore Cup of Death and/or Zork. Are they "interactive narratives" by your definition? Is an interactive narrative even possible, or is it a contradiction in terms? What, if anything, does interactivity add to a narrative? In other words, you are making and defending a claim about the value or significance of interactivity, through one chosen text.
Option #2) Focusing on specific passages, use either Joy or Lyotard to respond to or analyze Do Androids Dream of Electric Sheep. This, too, should be in the form of an essay - that is, it should have an argument which you defend.