Samuel Adams and John Hancock helped to start the Sons of Liberty in order to protest the Stamp Act.
The Sons of Liberty was a secret organization that was formed in the American colonies in the late 1760s to protest British taxation and other perceived injustices. The group was founded by Samuel Adams and other colonists in Boston, and it quickly spread to other colonies. The Sons of Liberty played a key role in organizing protests and resistance to British rule, including the famous Boston Tea Party.
John Hancock, who was a wealthy merchant and political leader in Boston, was also an active member of the Sons of Liberty and played a key role in organizing resistance to the Stamp Act.
Therefore, the correct answer is option D: Sons of Liberty.