The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
The English challenged Spanish sea power although the Spaniards were known to have the best navy of the time. What Queen Elizabeth did in 1587 was to name Lord Howard of Effingham to lead the English navy against the Spanish armada. The English nobility accepted the movement and decided to back Effingham as the leader of the British navy. He had the knack to be able to listen to more experienced voices to make decisions, as was the case of his vice-admiral Sir Francis Drake, who really was a renowned sailor.
The Nazi state sought to establish control in many ways, such as when Adolf Hitler became Chancellor in 1933 and made the first Decree which was passed Feb. 28, 1933, the first Decree abolished all rights the people had in Germany such as freedom of speech, press, and assembly. The Decree also set up concentration camps and sent communists and jews there. On March 3rd, 1933 the Enabling Act was passed, the Act established Hitler's dictatorship in Germany, banning all other political parties. The Nazis took control of the military, media, and judiciary matters of the country. this Act also granted the Gestapo, the Secret Service, and the police large amounts of authority over society, this allowed the Gestapo detain people in their torture chambers, send them to concentration camps and deport them at will.
Industry vs. Farming, States Rights, Expansion, Slavery. All these were causes of the Civil War.
The question is asking to determine the year the the natural gas would last according to some estimate, base on my research and further investigation, the possible answer would be 92 year. I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification