Which of the following statements is correct regarding Mountain-Valley breezes? a. During the day, valley air heats rapidly and rises upslope. At night, mountain air cools quicker and moves downslope into the valley. b. Valley air remains cooler than mountain air both day and night and only moves down the valley, but not upslope. c. During the day, mountain air heats faster than valley air and moves downslope to the valley. At night, valley air cools faster and rises upslope. d. Mountain air always rem