They have changed. Into what we see today.
We didn't evelove from any of them, but we share a common ancestor. The fossil record (at least what we have found so far) isn't clear on what it loooked like, but suffice to say it would have been quite unlike both the ape species and the human species, base on extrapolation.
And "believing" in evolution undermines its cause. Science is not a matter of faith, it just comes down to which opposing
scientific theories you take to be most accurate, based on the evidence available. The current theory of evolution (via Natural Selection and all that jazz... genes and such like) is the only currently available explaination for the diversity and origin of modern life (and evidence of past forms) based upon sound scientific data. And so it is.
Another common misconception is that science "proves" ideas and theories. Nothing is proven. That grass is green is not proven. But it is the best conclusion drawn from the evidence that we have accumulated. Evidence is found, and theories are drafted, tested, modified or retired as required.
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I don't like scientists on my committees. Give them some more data, and they change their minds!
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Some people (especially politicians) wouldn't even realise this was a joke.