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".

The teacher caught the student chewing gum, so the student spit out the gum
plausible

The grape juice fermented, so I opted for the red wine
plausible

The surfer caught the wave, so it was ready to go

not plausible