Which best describes the big bang theory?

A.

Our universe is not the only universe.

B.

The universe is expanding.

C.

The universe is 4.6 billion years old.

D.

The universe is shrinking.

The question is asking to choose among the following choices that describes about the Big Bang theories, base on my research and further investigation, I would say that the answer would be letter B. The universe is expanding. I hope you are satisfied with my answer and feel free to ask for more