I believe the answer is: C: The articles threatened national security
According to the national defense departement, publishing articles regarding Military tactics in vietnam war would potentially endanger the troops in vietnam. We cannot know if vietnam troops have any spies in national soil, so as a precaution, the articles is banned from being published.
The pharaoh was assisted by a hierarchy of advisors, priests, officials and administrators, who were responsible for the affairs of the state and the welfare of the people. Ancient Egypt could not have achieved such stability and grandeur without the co-operation of all levels of the population.
You didn't provide the selection of words but...
I would say its experiment or investigate.
Answer:
Explanation:
The coal industry has decreased so much because of the push to switch to renewable resources, so people are using alternatives to coal for heating.