What challenge did President George Washington face regarding the executive branch?

A It was too big for him to run alone.

B He needed to figure out its purpose.

C He needed someone to oversee it.

D It had too many departments.

Id say your best bet is A because Washington established the cabinet which aids presidents in running the country. It cannot be B, C or D because congressional oversight was already established by the constitution, there were only a couple departments, and the constitution already defined its purpose.