The correct responses to the question regarding how American colonists responded to the passage of the Townshend Acts of 1768 are:
(Choice B) They organized boycotts of British goods, and merchants signed nonimportation agreements vowing not to buy or sell British goods.
(Choice C) They formed committees of correspondence to rally opposition to British policies and educate colonists about their rights.
Choice A is incorrect because the "Olive Branch Petition" was sent in 1775, which was after the Townshend Acts were enacted.