Consider a Density Fluctuation Around the Era of Recombination When

Multiple Choice

Consider a density fluctuation around the era of recombination when the universe had a temperature of 3000 K. If the density fluctuation is about 10 ly across, will the matter within that fluctuation begin clumping together?

A) The Jeans length for these numbers is about 100 ly. Matter will not begin clumping together because there is not enough mass in the fluctuation of 10 ly to overcome the gas pressure.
B) The Jeans length for these numbers is about 100 ly. Matter will begin clumping together since this is within the Jeans limit.
C) The Jeans length for these numbers is about 1 ly. Matter will not begin clumping together because there is not enough mass in the fluctuation to overcome the gas pressure.
D) The Jeans length for these numbers is about 1 ly. Matter will begin clumping together since this is within the Jeans limit.