D. President Eisenhower ordered troops to protect students in Little Rock, Arkansas
Explanation:
Executive order refers to a directive issued by the president of United States to manage a certain federal matters. Executive orders tend to be made if the president felt the need to take a quick action without having to wait the law making process through the congress.
Eisenhower's order for the troops to protect students in Little Rock was known as the Executive Order 10730 . The soldiers were sent to protect black students from angry mob after the school implemented desegregation
