TASK DEFINITION: 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".
PROBLEM: I received a package in the mail, so i thought i would give it a try

SOLUTION: plausible

PROBLEM: The man signed the document, so it's not like it's a secret

SOLUTION: plausible

PROBLEM: The archeologist dug up the site, so it was a no brainer

SOLUTION:
not plausible