Which argument states that an unmoved mover must exist to explain all motion in the universe?

The correct answer identifies the Argument from Motion as the argument that states an unmoved mover must exist to explain all motion in the universe. This argument, primarily associated with Aristotle, posits that everything in motion must be set in motion by something else. Since an infinite regress of movers is deemed impossible, there must be a first, uncaused mover that initiates all motion without itself being moved. This unmoved mover is often identified with God in classical metaphysical discussions.

The significance of this argument lies in its foundational importance for later philosophical thoughts on causality and existence, particularly in the works of thinkers like Thomas Aquinas, who formulated his own version to support the existence of God. This argument is rooted in observational reality—everything we see in motion must derive its state of motion from another source—a principle that underscores the need for an initial cause that itself is not caused.

The other options, while related to concepts of causality and existence, do not specifically address the nature of motion in the same direct way as the Argument from Motion does.