The main purpose of the declaration of independence was to:

a. argue that a new government was necessary to protect the rights of the people.
b. force the king to leave the throne so that the colonists could choose another.
c. show how bad britain is so people move to the colonies.
d. illustrate the best way to make an effective deductive argument.

A.argue that a new government was necessary to protect the rights of the people.

Explanation:

The unanimous declaration of the thirteen United States of America is a document drafted by the Second Continental Congress - in the Pennsylvania State House (now Independence Hall) in Philadelphia on July 4, 1776 - which proclaimed that the Thirteen American Colonies - then at war with the Kingdom of Great Britain - they had defined themselves as thirteen new sovereign and independent States and no longer recognized British rule; instead they formed a new nation: the United States. John Adams was one of the politicians who undertook the independence process, approved on July 2 by the full Congress without opposition. A committee was responsible for drafting the formal statement, which was presented when Congress voted on it two days later.