What Factors Combined to Lead to a Rapid Change in Position

What factors combined to lead to a rapid change in position on revising the Articles of Confederation?

A) statements made by state governors and populist sentiments evidenced by Shays' Rebellion
B) the belief that local fates could be separated from national interests and secessionist movements in the southern states
C) the failure of the Confederation Congress to adopt moderate proposals for amending the Articles and statements by national political figures
D) pressure from the Confederation Congress for a national constitutional convention and statements made by American military leaders