What purpose do cooling towers serve in a nuclear power plant?

A. to retain the nuclear gases emitted from the nuclear reactions
B. to provide a location for the heated water to cool and condense
C. to maintain the high temperatures required for the nuclear reactions
D. to act as a barrier to contain radiation in case of a possible meltdown

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.