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 can trap ethylene gas produced by the banana, which accelerates the ripening process, leading to more browning. In contrast, polyethylene wrap does not trap the gas in the same way, potentially slowing down the ripening process. Thus, the use of polyvinyl wrap would result in increased browning of the banana half.