What line does Hamlet famously ponder in Act III, Scene i?

The famous line that Hamlet ponders in Act III, Scene i is "To be or not to be." This soliloquy is one of the most well-known passages in English literature and encapsulates Hamlet's deep existential crisis and contemplation of life and death. In this moment, Hamlet reflects on the nature of existence and the pain of life, weighing the merits of enduring suffering versus the uncertain nature of death. The line represents the central theme of Hamlet's struggle with the consequences of action and inaction, as well as his philosophical musings on mortality.

The other options, while notable quotes from literature, do not appear in this specific scene of "Hamlet." The quote about dreaming reflects another of Hamlet’s contemplations, but it comes later in the same soliloquy. "The lady doth protest too much" is a line spoken by Gertrude in Act III, Scene ii, signifying her awareness of the play's reflection on hypocrisy and deceit. The final option regarding changing the world is attributed to Gandhi and is not related to Shakespeare's text at all.