What does the executive officer of the president do for the president of the united states?
a. supports and advises the president
b. leads legislative departments
c. nominates and advises the president
d. lead all branches of the military

The correct answer is
A. Supports and advises the president

They are like the supporting staff whose goal is to help the president manage ruling the country. The head of the executive office is called the Chief of Staff. There are numerous people there advising the president on all major things from economy to healthcare to war efforts.

It was a combination of conquests and alliances