Knowing that a model is considered a representation of something, the correct option is option B, in which the apple represents the Earth.<em> An apple is sectioned into quarters to represent the ratio of water to land on Earth.</em> 
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To answer this question, you can think about a model as a representation of something. 
 
A scientific model can represent an object, a system, a process, a phenomenon, etcetera. 
 
Models are used to explain, predict, or describe natural events. They constitute a significant tool in modern science and are essential to scientific practice. 
Knowing this, among the provided options, the one that is a model is <u>option B. </u>
<em>The apple is representing the ratio of water to land on Earth. </em>It is a representation of the earth. 
All the other options are experiments performed to see what is going to be the result. 
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You can learn more about models at
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