Read the excerpt from Act II of The Crucible by Arthur Miller.

MARY WARREN: . . . Judge Hathome say, “Recite for us your commandments!” (leaning avidly toward them) and of all the ten [Sarah Good] could not say a single one. She never knew no commandments, and they had her in a flat lie!

PROCTOR: And so condemned her?

MARY WARREN, now a little strained, seeing his stubborn doubt: Why, they must when she condemned herself.

PROCTOR: But the proof, the proof!

MARY WARREN, with greater impatience with him: I told you the proof. It’s hard proof, hard as rock, the judges said.

PROCTOR, pauses an instant, then: You will not go to court again, Mary Warren.

MARY WARREN: I must tell you, sir, I will be gone every day now. I am amazed you do not see what weighty work we do.

PROCTOR: What work you do! It’s strange work for a Christian girl to hang old women!

MARY WARREN: But, Mr. Proctor, they will not hang them if they confess.
Based on this excerpt, which choice best describes how the author uses the character of Mary Warren to advance the plot?