Kati starts from the window and Peter from the wall was not accepted. I've reported it. Just as Hungarian uses pedig to avoid the need to repeat the verb, so English has the same facility without the need for pedig. We don't need to repeat the verb.
Is it acceptable to use "set off" instead of "start"?
I think so.
Is it hard for others to distinguish the sounds of faltól and fától?
It is quite impossible for my ear
Yes, it's often hard!
One of the incorrect options has a typo: 'coutries'