Out of those options, choice C is the most likely to be organized with categories and subcategories to clarify relationships and distinctions.
A simple title like "Why Ravens Are the Smartest Birds" does not indicate any clear categorization scheme.
"Ravens vs. Crows: What’s the Difference?" suggests a comparison but not necessarily a nested categorization.
"Understanding Crows, Ravens, Magpies, and Other Members of the Corvid Family" directly points to categories (crows, ravens, magpies) with subcategories (other corvid family members) for clarification.
"Ravens Remember: A Riveting Tale" is just a dramatic title, not indicating any categorization.
So choice C, "Understanding Crows, Ravens, Magpies, and Other Members of the Corvid Family" is the best example of a text likely organized with categories and subcategories.