Which of the following deeds is the greatest achievement of Theseus? A: Killed the bandits like Sinis, Sciron and Procustes. B: Foiled(挫败) Medea’s attempt to have him poisoned. C: Killed Minotaur in the Labyrinth and saved the young boys and girls from Athens. D: Abducted(拐走) Helen and tried to get Persephone from the Underworld with Peirithous.