Which of the following careers is not included in the government and public administration cluster?
a. teaching/training
b. foreign service
c. regulation
d. national security

"A. teaching/training" is not included in the Government and Public Administration cluster, because although teachers can work for public school systems, this is done primarily at the state level.

The answer is challenging and taxing because arduous means when something is hard and tiring and the excerpt provides clear detail why that's the answer