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The idea that the universe began from a single point and expanded to its current size explains a large number of observations, including those in the table below.

In addition, many predictions based on the idea have led to additional observations that support it. This idea of the origin of the universe is best classified as a
.

Explanation: The dictionary definition of theory is a system of ideas that are used to logically explain something. It also says that they are also based off of something not entirely connected to the thing the theory is being made about.

Because the idea that the universe has expanded explains such a large number of observations, which in turn leads to more predictions and therefore more observations that support it, this becomes your system of ideas. Because this system was based off of the aforementioned observations in the first paragraph, this proves that it is best classified as a theory.