Replication is carried out by DNA in existing cells, but why is it more likely that the original replicating?

Question

MOLECULE IN CELLS WAS RNA RATHER THAN DNA

Answer 1

RNA is more likely because it's 3D structure can change, since it's single stranded. RNA can change shape, depending on the sequence, whereas DNA is always some type of double helix. RNA can have enzymatic activity, whereas DNA doesn't.

Answer 2

You may have better luck with a response if you re-word your question. As it is right now, the question doesn't make sense.