Respuesta :
Answer: The answer is A. VALLEY AIR HEATS UP DURING THE DAY AND RISES UP THE SIDE OF THE MOUNTAIN
Explanation: Valley breeze is the breeze that blows up valleys on clear days. It is produced during the day when the floor of a valley is rapidly warm by the sun and causes the warm air to expand and rises up the slopes of surrounding mountains and hills through convection to create a valley breeze.
During the night the slopes get cooled and the dense air lowers into the valley as the mountain wind.