There Are Three Possible Fates for the Universe: 1)eternal Expansion;

Multiple Choice

There are three possible fates for the universe: 1) eternal expansion; 2) total collapse; or 3) some equilibrium condition with no further motion.What conditions might favor one result over the other?

A) Critical velocity-is there enough momentum to continue expansion forever?
B) Critical density-is there enough mass in the universe to cause gravitational collapse?
C) Critical energy-is there enough energy in the universe to maintain either expansion or collapse?
D) Critical volume-is the universe large enough for unlimited expansion?