What factor determines the classification of a thunderstorm stage?

Good Morning!
 
In general, a storm has three stages. The first is development, the second is the mature stage and the third is the dissipative stage. The most striking difference in the stages is the change in currents. The beginning of the storm occurs with an ascending current, which causes the cloud to grow vertically. Then, with the precipitation, downward currents begin, through the friction caused by the rain. During this period the two currents, ascending and descending, reach their peak, gradually dispersing in the final phase.

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The correct answer is kettles.

Ido believe it is b