Correct Answer: C
Explanation:
if a sixth team enters all events and wins only three consecutive silver medals, must win the silver in events 2,3 and 4, so that it does not fail to win a medal within two consecutive events.
therefore out diagram would look like this:
therefore, if yellow wins a gold in the 2nd event, green must win a medal in the 3rd event (since no team fails to win a medal within two consecutive events). Thus, green must win a bronze in the 3rd event.