Evolution is basically organisms reproducing and one of them having a unique trait. If the trait isn't good, they will most likely die off. If the trait is beneficial, then they will give that trait to their offspring. If it doesn't really benefit or do anything bad, then the trait may or may die off. So the only option is the third one. The fourth one might look right, but that is inheritance acquired for the parent organism. Most likely a trait not able to be passed off.
