Question

why did eisenhower send federal troops to central high school in arkansas?
to assist local police who were struggling to contain an angry white mob
to remove the national guard who had been sent by governor faubus
to block african american students from entering the school
to prevent white students from attending and integrating the school

Explanation:

In the 1957 Little Rock Nine crisis, Governor Orval Faubus deployed the Arkansas National Guard to block Black students from integrating Central High School. President Eisenhower sent federal troops to counter this, remove the National Guard, and enforce federal desegregation orders, allowing the students to enter. The other options are incorrect: federal troops supported integration, not blocking Black students; they were not assisting local police with a mob as the primary goal, and they did not prevent white students from attending.

Answer:

to remove the National Guard who had been sent by Governor Faubus