Which organization is a major part of the executive branch

a. the u. s senate
b. the supreme court
c. the house of representatives
d. the federal bureaucracy

Organization which is a major part of executive branch is The federal bureaucracy.

Explanation:

The "executive branch" of the Government is the Federal bureaucracy. It makes sure that all the laws of the country are obeyed. They enforce laws.

The head of executive branch is "The President". Vice President helps him in the process along with heads of the department which are the Cabinet ministers and the heads of independent agencies. These heads are selected by the President. So, "option D" is the correct one and other options are incorrect.

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )