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 woman sensed a pleasant smell, so she opened the door to see what was going on
plausible

The man looked at his watch, so he knew it wasn't him
not plausible

The boaters set off a flare, so I didn't get a good look at them

not plausible