This question is a nightmare. The right answer isn't really there. A short answer would be that New England didn't want a second war with Great Britain. There was a real gaffuffle about pressing American seaman into British Navy vessels that cause Jefferson to impose an embargo. All of this centered about the war of 1812.
The choice is between A and B. I would pick A, but I can't eliminate B.
C and D are not really amongst the reasons, particularly C.
A is the answer i beleive<span />
Norman Borlaug also known as the "father of the Green Revolution".
As an American engineer he is one of the key contributors to the revolution in agronomy. He was aided by international organizations to tackle low productivity levels in underdeveloped countries such as Mexico. There was a rupture to the traditional methods of harvesting that caused great numbers of starvation caused by famines.
The Green Revolution included developing high yielding types of cereal grains, modernization of irrigation infrastructure, expansion and improved of management techniques. There were also important changes concerning the distribution of hybridized seeds, synthetic fertilizers, and pesticides to regional and local farmers.
Unify the North American states under Prussian control. Weaken Prussia’s main rival, Austria by removing it from the bund. Make Berlin the center of Germany affairs.