The word Aztecs is a proper noun, because it is a name of a certain nation.
Common nouns are words such as table, chair, desk, etc. Compound noun is just a noun that has more than one word, such as brother-in-law. Collective noun is a noun such as deer, sheep, etc.
I would say A)...
The topic of three styles of dog training can be broken down into many sub-categories. A topical pattern of organization organizes the information into subtopics.
Could you give more context?