T3W5 TS Q25 – Selective High School

To win in an adventure computer game, you must complete all the main quests and half the side quests.

If this is true, which one of these sentences must also be true?

If Giselle completed all the main quests and won, she must have completed all the side quests. If Giselle did not win, she must have not completed all the side quests. If Giselle did not complete all the main quests, she can still win. If Giselle completed all the side quests and won, she must have completed all the main quests.

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If this is true, which one of these sentences must also be true?