Eisenhower place the Arkansas national guard under army command because he needed the guard to follow the law not the governor of Arkansas.
Desegregate schools in America
During the effort to desegregate schools in Little Rock, Eisenhower put a national guard in Arkansas to protect the law against segregation.
Segregation was present in America after the Civil War in America that divided both white and black from one another.
The South maintained segregation in school, public transportation and public places.
The desegregate was the government's decision to allow blacks to study in white schools.
For the safety of children and law, national guards under army command called in Arkansas.
Thus option D is the correct answer
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