Which of the rock examples below is most likely to be metamorphic

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

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.