The right of life, liberty, and the pursuit of happiness is stated in the: Mayflower Compact Constitution Declaration of Independence

Right choice is:

Declaration of Independence.

Explanation:

It is clearly stated in the Declaration of Independence of July 4, 1776, that all men are born equal and have inalienable rights such as the right to life, to liberty and to the pursuit of happiness.  All these ideas are Enlightenment ideas, exposed by great British and French philosophers in the 17th and 18th century. As the Declaration was mainly written by Thomas Jefferson, we know he was well acquainted with the ideas of the British thinker John Locke.  

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