Out of the given options, Event 2 is the only one that has the potential to cause a cyclone, as it describes the meeting of cool and warm air masses, which can create a low-pressure system and potentially lead to the formation of a cyclone. Event 4, which describes an underwater earthquake, is not related to the formation of a cyclone or tornado.
Therefore, the most likely correct statement is: Event 2 may cause a cyclone and Event 4 is not related to the formation of a cyclone or tornado.