The given question is incomplete as there is no essay provided.
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Clouds form in three basic patterns: Cirrus, Stratus, and Cumulus, since I can't see the passage this is the only way I can answer.
B is the correct sentence
Meaning, they should be told what to do without question every once in while. Discipline/guidance/structure supported by the idea stated above.
Here are some words
decaying.
decomposable.
destructible.
easily spoiled.
short-lived.
unstable.