What are the options for the claims?
Prospero stops the show because he suddenly remembers that Caliban has issued a challenge, and the hour of that challenge is almost there. Ariel asks Prospero what's wrong, after he abruptly stopped the show, and he responds with "We must prepare to meet with Caliban" which shows where his mind is.
The answer is that the present participial phrase that describes John is this: Jamming too much trash into a garbage bag. It is defined that a participial phrase consists of a participle plus modifier(s), object(s), and a complement.
