The entire universe is purposeful as the evolution of life depicts how everyone has a role to play on Earth.
Life didn't "pop up" accidentally on this particular planet called Earth. Earth was designed to accommodate human beings. No matter how big or small the purpose is, everyone on Earth has a purpose.
There's no one that's purposeless. One common purpose to every human is survival. As individuals, we strive daily on how to survive and meet our needs.
B. Executive because the president is in the executive department or branch. It could not be administrative because that is not one of the three departments or branches.