The passage uses a topical structure. How does this structure help develop the passage? A: The topical structure allows the author to describe different aspects of Pluto, including its physical characteristics and orbital cycle. B: The topical structure allows the author to describe different objects in outer space, including Pluto and Eris. C: The topical structure allows the author to compare Pluto to its closest planet, Neptune. D: The topical structure allows the author to describe different dwarf planets in the solar system.