Path A: Wales would defeat Austria and Ukraine would do the same against Scotland. And after a Wales - Ukraine matchup, Wales would manage to qualify for the World Cup.
Nothing against Wales, but I think Ukraine's probability of victory is much higher than that of Wales. Wales have good players, but even so I think Ukraine is more likely to reach the World Cup than Wales. If Wales makes it, it's history for them.
Normally I agree that Ukraine have a really big attacking power so they can have an important opportunity here also. But Wales are a really interesting team that they can surprise people. I remember their performance in the Euro 2016 tournament. They reached even the semi-finals but were eliminated by Portugal that won the title also. But Walves are not showing the same performance now also. We will see what happens.