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 mirror in the bathroom fogged up, so I could not see what was going on
plausible

The girl went down the hill on her bike, so it was nice to see her again
not plausible

The pond froze over for the winter, so the rain was a welcome sight

plausible