The Truman Doctrine was an American foreign policy that wanted to counter Soviet Geopolitical expansion during the Cold War
I believe it was B since he reversed several previous positions. While he did meet with MLK, I don’t think he had anything to do with founding the SCLC.
The answer is B because the Mechanical Reaper changed the way the world worked at the time; It made the demand for slaves go up as the work necessitated some manual work
C they provide a type of instruction manual on how to worship God and live life
When a country establishes foreign policies, the interest of the country itself (A) is the most prioritized interest in constructing foreign policy. This is logical given that a country creates a strategy for foreign policy and national security based upon representing their own peoples interests first.