Which was a key to writing and ratifying the U. S. Constitution? compromise by one group of delegates

refusal to compromise on any side

willingness to compromise on all sides

the impossibility of compromise

the Constitution was a document that was written with a variety of factors, perspectives, and desires at work. Because of this it was vital that the parties involved could compromise on issues such as state representation, the powers of Congress, the Executive, and the Legislature as well as other issues of the time such as slavery and the determination of counting slaves a part of a population. Therefore, the best answer to this question is most likely A.        

d) a constitutional amendment

i'd assume india mainly because of how isolated japan was.   plus it is a whole china away.