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".

I was confused by the professor's lecture, so i decided to check it out
plausible

The girl came across an unfamiliar word in her textbook, so she explained it to him
not plausible

The girl found the missing puzzle piece, so she went back to it

plausible