Which condition is important for a temperature inversion? two layers of warm air

two layers of warm air, one on top of the other

a layer of warm air over a
layer of cold air

a layer of cold air over one of warm air

the answer is that"a layer of warm air over a layer of cold air" which can be caused by factors like formation of fronts, scattering, advection.

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a