Answer: D is right. But there are also many other reasons.
Explanation: League of Nations was formed by Allied powers (from the WW I) so consequently it was viewed as "League of Victors". Moreover USA did not join, may other states did not join and later on League of Nations was unable the prevent outbreak of WW II.
The answer is C, Red River and Arkansas River.
What comes to mind is salvation although I can't be sure, it makes the most sense.
Answer: slaves sold in the slave market at montgomery came largely from virginia, north carolina,and tennesese.