Need help in justifying RC answer

Hi all,
This is regarding one of the questions found in GRE Official Guide (Set 4 Q9). I have attached the screenshots for the passage and the Q below for reference

During my attempt I had picked option D.
Answer: Option E

My justification:
A,B,C we can find the proof for, and for Option E aren’t lines 10-12 proof?

Is the reasoning for answer being E) is that as per lines 10-12, there are 2 moods but E) talks about the expansion i.e more states getting formed?


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