The correct response is: "The polyvinyl wrap probably caused the browning since it traps ethylene gas which would speed up the ripening process."
Polyvinyl wrap is known to retain ethylene gas, which is produced by fruits and can accelerate the ripening process. This would lead to the browning of the banana half, as it would enhance the natural ripening process. In contrast, polyethylene wrap does not trap ethylene gas in the same way, potentially reducing the effects of ripening and browning.