Which was a key to writing and ratifying the U.S. Constitution? A. willingness to compromise on all sides B. refusal to compromise on any side C. compromise by one group of delegates D. the impossibility of compromise

The Constitution was a document that was written with a variety of factors, perspectives, and desires. Because of all these factors, it was critical that both parties involved could compromise on issues. Therefore, the best answer to this question is most likely A. 

Answer:willing to compromise on all sidesExplanation: let me know if I'm incorrect