Pretty sure that it’s D... I recommend you do some research though.
Answer:
D
Explanation:
More studies need to be done to determine the possible detrimental or beneficial effects of watching cartoons.
A because nobody is a pronoun that references multiple people, it does not have a plural form so normal punctuation is required
Answer: The electronics she has a receipt for.
Explanation: All appliances she can show a proof of ownership over can be moved with her as her personal property.
A because the correct way to write that sentence should be "When I came home, the floor was wet, the pillows were chewed, and the plant was knocked over." Or a couple of other ways you could correctly word that sentence.