The correct response is:
The universe is cooling which, according to the Big Bang Theory, is expected to happen as the cosmos disperses.
This aligns with the predictions of the Big Bang Theory, which posits that as the universe expands, it cools over time. Observations of the cosmic microwave background radiation indicate that the universe was once hot and dense but has since cooled as it expanded. This cooling is consistent with the idea of an expanding universe following the Big Bang.