Which statement best identifies John Adams’ contributions to early American government?

A. He was a prominent Jeffersonian Republican and helped ensure that the states would be as powerful as possible.
B. He contributed to the Federalist Papers, served as the country’s first secretary of state, and served two terms as the country’s second president.
C. He was a diplomat and political philosopher who helped Thomas Jefferson write the Declaration of Independence and served as the nation’s first vice president.
D. He served as the country’s first secretary of the treasury, wrote the Declaration of Independence, and was elected as Thomas Jefferson’s vice president.

John Adams contributed significantly to early American government. He was a key figure in the writing of the Declaration of Independence, along with Thomas Jefferson and later served as the nation's first vice president. Additionally, Adams played a crucial role in the Federalist movement, contributing to the Federalist Papers and eventually serving as the second president of the United States, thus leaving a lasting impact on the country's early political landscape.