What is the main job of the president

The president of the United States has one of the biggest and hardest jobs in the world. As the leader of one of the world's most powerful countries, the president

-runs the military as commander in chief of the armed forces

-negotiates treaties, or agreements, with other countries.  

-appoints Supreme Court justices and other judges

-proposes new laws and signs them into legislation when Congress passes them

-can veto bills that Congress passes

-appoints ambassadors to other countries and sets foreign policy

-helps decide how much money the government will spend each year

-appoints the heads of, and helps run, the government's many departments

i think the answer is   b.