Answer:
The answer is b. from repeated circulation of raindrops above and below the freezing level in a cloud.
Step-by-step explanation:
Hail is formed by repeated circulation of raindrops, large water droplets, or high liquid water content in air environments that have strong upward currents of air, and where temperatures of cloud layers are somewhere above or below the freezing level of 0°C (or 32°F); most temperatures are below the freezing level.