DNA is an acid that contains resources needed for development and function of every living thing, EVERY LIVING THING. even bacteria and viruses have DNA. without DNA there would be no life.
I believe that the answer is (A) , cause if their hetero then it could be a 50/50 chance so if its not (A) then it might be (D)
forgive me if i am wrong, have a nice day! :)
Cnidarians belongs to Animalia kingdom
hope that helped