Option B, NASA is an independent executive agency
Explanation:
The National Aeronautics and Space Agency is an independent organisation liable for the social space program, aeronautics, and aerospace experimentation, of the US Federal Government. In 1958, NASA was set up, under the National Aeronautics Advisory board.
NASA, particularly Apollo Moon landing flights, the Skylab Spacecraft and the Space station, has guided most of the US space exploration activities since its inception. NASA funds the Space shuttle internationally and manages the Apollo Multi-Purpose Crew Vehicles production, the Satellite launch Program and Launch services vehicle growth.