In Antigone, Antigone argues with Creon during Scene 2. Why does Sophocles include this argument?

to show that both Creon and Antigone acted mercifully, but Creon's excessive mercy is the source of his downfall

to show that Antigone acted mercifully in giving her brother a burial, but Creon's lack of mercy leads to his and Antigone's downfall

to show that only the gods are capable of mercy, which is why Creon and Antigone are given opportunities to avoid their downfalls

to show that neither Antigone nor Creon is capable of acting mercifully, which leads to both of their downfalls