Erwin Rommel he was known as "desert fox" due his victories when he was deployed in Africa
Hitler and his armies were denied oil from the middle east, cutting off their supply.
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.
Sit-ins and freedom rides advocated C. NON-VIOLENT PROTEST.
Non-violent protests or non-violent resistance is the practice of achieving goals such as social change through symbolic protests, civil disobedience, economic or political non-cooperation, or other methods without using violence.
Other methods of Nonviolent protests and persuasions are:
1) student strikes
2) sit-downs
3) turning one's back
4) vigils
5) "haunting" officials
6) disrobing