Which sentence correctly explains the process and conditions needed for sleet to form?
A During thunderstorms and extremely cold temperatures, water droplets freeze in layers and form balls or chunks of ice.
B Both the temperature of the cloud and the temperature of the air must be below freezing in order for the flakes to fall from the sky.
C A liquid form of precipitation that is formed in above freezing temperatures becomes heavier as it falls the ground in the form of raindrops.
D Ice crystals melt as they fall through a warm layer of air and then refreeze into small ice pellets as they pass through a colder layer of air
