Which amendment protects rights not spelled out by the Constitution but "retained" by the people?

The full text of the Ninth Amendment is: The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people. Prior to, during, and after ratification of the Constitution, debate raged about the protection of individual rights.

Explanation:

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its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.

which statement explains one of the reasons world war 1 was so much more destructive than earlier conflicts