In this task, you will be given two sentences separated by ", so". You should decide whether the first sentence can be the cause of the second sentence. If you can see a possible causation, answer with "plausible", otherwise answer with "not plausible".

I was confused by the professor's lecture, so I thought I'd ask here
plausible

The motorcyclist twisted the throttle, so causing the motorcycle to overturn
plausible

The pond froze over for the winter, so it's just a matter of time before we get to the bottom of the pond

not plausible