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.