Answer: D)
Step-by-step explanation:
I wrote you options in the details and I think that the real question is to show is this sentence correct or not. It is correct and it doesn't need any changes.
The only thing that is not right is a verb. It should be ''eat'' not ''aet'' but I think that it is just your misspelling.
The blue Jays is the subject in this sentence and they were chased by the cat because they were eating porches.