They had what they needed and nothing more they thought that they did not need huge empires
Both mobilizations were important, but the industrial one seems to have greater weight, since this influences the population in general, and the military affected only where a conflict developed, it mobilized all available resources to obtain the highest military capacity in a specific area, but the industrial one had the capacity to produce what was necessary for war, as a fundamental and determining element in the outcome.
they feared the influenced of a Catholic monarch
C: disease would kill ideas before they even spread
It seems like B is the most likely answer, considering it's really the only one that applies to democracy.