Final answer:
Option (C), Sam Adams established the Committees of Correspondence, which helped unify the colonists' identity by facilitating inter-colonial communication and coordinating efforts against British policies, leading up to the American Revolution.
Step-by-step explanation:
Sam Adams created the Committees of Correspondence which played a pivotal role in fostering a sense of American identity among the colonists, beyond their individual colonial affiliations. These committees enabled leaders from different colonies to exchange information, share grievances, and coordinate responses to British policies.
This network of communication among the colonies made the Committees of Correspondence a significant force in uniting colonists and laying the groundwork for joint action against British rule. They also formed the backbone of communication during key events leading up to the American Revolution, such as the rebellion against the Tea Act and eventually the revolt against British authority.