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The correct answer is A. Think of the rings of a tree trunk:  Each planet travels around its own ring, carving out its own path in the solar system.

Explanation:

In writing, making a comparison involves mentioning or describing an element with similar characteristics to better explain an idea. This occurs in the case of "Think of the rings of a tree trunk.  Each planet travels around its own ring, carving out its own path in the solar system" because the arrangement of the rings in a trunk is similar to the arrangement of orbital planets, which is the main idea the author tries to describe. Also, the idea planet carves out a specific path in the Solar system follows a ring-like structure help readers understand the movement of planets described in the explanation. Thus, it is in this option there is a comparison to clarify.

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