Question

in the big bang model, which describes a universe that will stop expanding and begin to contract? open flat closed elliptical

Explanation:

In the Big Bang model, a closed universe has enough mass - energy density to cause gravity to overcome the expansion. Eventually, it will stop expanding and start contracting. An open universe expands forever, a flat universe has a critical density and expands forever but at a gradually decreasing rate, and "elliptical" is not a standard term in this context for the overall fate of the universe in the basic Big Bang model discussions.

Answer:

closed