The most effective argument in Thomas Paine’s "Common Sense" that persuaded undecided colonists to support independence from Britain was likely:
A. the idea it was absurd for a smaller territory like Britain to own a larger one like the thirteen colonies.
This argument appealed to common sense and the logical reasoning of many colonists who felt that it was unreasonable for a distant power to exert control over a vast and growing territory. This perspective encapsulated the sentiment of independence and self-governance, making it a powerful and relatable point for undecided colonists at the time. While all the arguments presented had their merits, the absurdity of the situation resonated deeply with a broad audience, fostering a sense of urgency for change.