Consider a Large Cloud of Hydrogen Gas, All at a Uniform

Multiple Choice

Consider a large cloud of hydrogen gas, all at a uniform temperature. How do density fluctuations within this cloud affect its tendency to collapse gravitationally?

A) In those regions where the density is larger the gas pressure will also be larger, and the gas will be less likely to collapse.
B) In those regions where the density is larger the Jeans length is smaller, meaning that smaller regions of the gas are likely to collapse.
C) The Jeans length must be calculated for the entire cloud. Density fluctuations within the cloud have no effect.
D) The likelihood of gravitational collapse cannot be calculated from the information given.