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.
Step-by-step 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.