Answer:
The correct option is D: All of the above
Step-by-step explanation:
To turn this concept into a theory Abigirl must try to show that "Politicians are well known and popular in the wealthier districts." From this theory in quotes, it can be seen that she moved from Bob to Politician, which satisfied option A of "moving from the specific to the more general". The "his district" has been changed to "wealthier districts", and this satisfies option B, which is dropping the proper nouns, and thirdly she is expected to examine if any previous research has been conducted in this line of study. Hence the answer is All of the above.