Which of the following is a way George Washington expanded the power of the presidency?

 
a. He appointed the heads of various federal departments as his own advisors. 
b. He refused to run again after serving two terms. 
c. He worked with the Senate to draft treaties with foreign countries. 
d. He submitted his neutrality proclamation to the Senate for approval. 

a. He appointed the heads of various federal departments as his own advisors.