Final answer:
The cosmological argument states that everything that exists must have a cause. One version of this argument is the argument from contingency, which posits that there must exist a necessary being on which all contingent beings depend. Another version is the argument from motion, which argues for the existence of a First Cause.
Step-by-step explanation:
The argument being referred to in the question is the Cosmological Argument. This argument states that every effect must have a cause, meaning that everything that exists must have been caused by something else.
One of the versions of this argument is the argument from contingency, which states that every being that exists is either contingent (dependent on something else) or necessary (self-existent). Since not every being can be contingent, there must exist a necessary being on which the contingent beings depend. This necessary being is what we mean by God.
Another version of the cosmological argument is the argument from motion, which argues that there must be a First Cause that set all other things in motion.