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 it was easy to get out
not plausible

It got dark outside, so didn't help us
not plausible

I rubbed sandpaper on the wood, so I didn't have to remove it

not plausible