Answer:
D - Sexual reproduction produces offspring which are different from their parents. Asexual reproduction produces offspring which are identical to their parent.
You should ask your teacher to be sure, but I think that you teacher meant like the mode of transmission.... Like genetically inherited and such.
They are like that because they can't always be faulty and may have at least some spark of truth to this theory also as stated earlier a theory in scientific terms is just an observation so it can't really be turned down hence theory.
Mitosis in the stage prophase chromosome and DNA is copied
