Hm, this is not an easy question.
Generally the best way to prevent a nuclear disaster is not to have any weapons, so A would be a good option. But in the modern world, complete destruction of all weapons is not feasible, and people believe that since US and Russia limited their number of weapons, this is no longer such a big concern (option D, which is I think the best. Personally, however I faviour A as a solution to the problem of nuclear weapons).
Answer:
A or B
Explanation:
I can't see the lines that your question mentions but the rich farmland is what attracted settlers to Oregon. The gold rush was in California, and the only huge thing that was discovered in 1849 (option D) is the gold rush, no mention of an oil boom.
North America and south America
Carter's foreign policy was oriented toward the goals of human rights and peace, negotiating an arms reduction treaty with the USSR, and a peace agreement between Israel and Egypt. Carter's ethos of humility and compassion informed much of his presidency and was reflected in his foreign policy and administration
