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 product was heavily advertised, so it didn't cost me anything
not plausible

The motorcyclist twisted the throttle, so causing a rear-end collision
plausible

The mirror in the bathroom fogged up, so I turned around to see what was going on

plausible