What Was the "Shotgun Policy

What was the "Shotgun Policy"?

A) a policy adopted by African-American leaders in Louisiana to defend themselves against whites
B) a massive campaign of violence against blacks in Mississippi to bring the state back under "civilized" white control
C) a policy frequently adopted in the Reconstruction South, requiring marriage if a woman became pregnant
D) the "Shotgun Policy" required the quartering of federal troops in areas that were considered Klan strongholds