The relationship between "Make a Model of the Water Cycle" and "Be Prepared" in the fact that both articles speak about the Weather.
The main idea that is taught in the "Make a Model of the Water Cycle" topic is that water evaporates, condenses, and falls as precipitation or rain.
In "Be Prepared", the students are enlightened about the fact that sometimes that precipitation is heavy and it results in a flood.
When that happens they must be prepared.
Therefore, the correct answer is C:
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