Final answer:
The quoted phrase reflects the theme that rigidity leads to downfall, capturing the essence of Creon’s dialogue in Sophocles' Antigone. Creon often speaks about stubbornness and yielding, but this exact quote does not appear in the play.
Step-by-step explanation:
The quote “The inflexible heart breaks first, the toughest iron cracks first” is said by Creon. The statement reflects on the characteristics of rigidity and stubbornness, implying that being unyielding can lead to downfall or breaking. This line, however, is not a direct quote from the play Antigone by Sophocles, but rather it conveys the essence of Creon's dialogue.
The correct answer to who said it about whom is not explicitly listed among the options provided. In the context of the play, Creon speaks of yielding and being obstinate, but this particular quote paraphrases Creon’s philosophy and imparts the lesson that the most rigid suffer the worst fates, which can be inferred from his actions and words regarding Antigone’s punishment and Haemon's pleas.