The correct answer is C) the right to a happy life.
<em>What would qualify as an "inalienable right" by the standards of the Declaration of Independence is the right to a happy life.</em>
The inalienable rights of the United States Declaration of Independence of July 4, 1776, are the Right to Life, to Liberty and the pursuit of Happiness.
Indeed, the textual paragraph of the Declaration of Independence reads: "We hold these truths to be self-evident that all men are created equal, that they are endowed by their Creator with certain unalienable rights, that among these are Life, Liberty, and the pursuit of Happiness."