How are the sections organized to help to develop understanding? A) The sections are organized by order of importance so readers know which theme of geography is most important to study. B) The sections are organized by topic so readers gain an understanding of each of the five themes of geography. C) The sections are organized in chronological order so readers understand when the different themes were first introduced. D) The sections are organized as problem and solution so readers learn why the five themes of geography were replaced by the National Geography Standards