Final answer:
If the density of matter in the universe turned out to be greater than the critical density, it would imply that the universe is closed (Option 1).
Step-by-step explanation:
If the actual density of the universe exceeds the critical density, it would mean that the universe is closed, destined to end in a 'big crunch,' and characterized by spherical geometry.
In this scenario, the universe will eventually stop expanding and begin contracting in an event commonly referred to as the "big crunch."
This outcome contrasts with an open universe, where the universe would continue to expand indefinitely if the density was less than the critical density.
The critical density is the mass per unit volume necessary to slow the expansion of the universe to zero at some infinitely far point in the future.
Moreover, in a closed universe, the geometry of space is such that initially parallel rays of light would eventually meet, indicative of a spherical geometry.
Hence, the correct answer is Option 1.