Answer the following question given this paragraph: 

There is a great deal of evidence that the Universe started with a big bang. The Big Bang theory is the most widely accepted cosmological explanation of how the Universe formed. Think about the expanding Universe, then reverse it. If we start at the present and go back into the past, the Universe gets smaller. What is the end result of a contracting Universe? A point.


Q: What do we call the most widely accepted cosmological explanation of how the universe formed?

 Choices:

- big crunch theory

- singularity theory

- big light theory

- big bang theory

A:
big bang theory
