Final answer:
The Big Crunch is described as universal contraction, where the universe collapses under gravity. However, it is unlikely to happen due to the influence of dark energy.
Step-by-step explanation:
The option that describes the Big Crunch is C) Universal contraction. The Big Crunch is a hypothetical scenario in which the universe, instead of continuously expanding, starts contracting under the influence of gravity. This would result in the universe collapsing in on itself, leading to a dense and hot state. However, with the discovery of dark energy, it is currently believed that the universe will continue to expand indefinitely and not experience a Big Crunch.