Final answer:
Highlighting and symbol usage are similar because they both employ categorization as a method to engage with and understand the text more deeply. Both strategies foster active reading and critical thinking.
Step-by-step explanation:
The best statement about how highlighting and thinking with symbols are similar reading techniques is Option D: When highlighting, you create categories for each color just as you create categories for different symbols. Both of these strategies involve actively engaging with the text by categorizing information.
Highlighting can be color-coded to track various literary devices or themes, while using symbols allows a reader to quickly identify and recall specific types of information or queries about the text. Both techniques help the reader to not only remember the content but also to critically engage with the material by categorizing and questioning the authors' arguments.