(GIVING BRAINLIEST!!) 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.

Explain Why.