Why do institutional relationships in foreign policy constitute a paradox?

Question

a. While foreign policy sometimes requires the input of a multiplicity of actors, it sometimes calls for an executive decision quickly endorsed by Congress. 
b. While many foreign policy issues are deeply complex, others are quite simple and require little consultation or debate. 
c. While foreign policy can have a significant impact on history, it does not affect the lives of American citizens to a great extent. 
d. While many actors are often involved in the formulation of foreign policy, all formal foreign policy power is in the hands of the president. 

Answer 1

a. While foreign policy sometimes requires the input of a multiplicity of actors, it sometimes calls for an executive decision quickly endorsed by Congress.