It would be D because it gives the most background and summary info to the questions
<span>Both answers "a" and "e" are correct here. Like most inventions that make their way into prosperity, the development of the airplane was made a priority to aid in military efforts. The Army saw an advantage in using the planes to strike enemies from above and far from the locations of their own troops. It made winning battles easier.</span>
Do it on your own don't give up... mistakes happen for a reason
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Sectionalism refers to placing local interests above those of the nation. As the states started putting their own values before those of others the hostility grew in the years preceding the civil war. It was the slavery that divided the North and the South a led to the growth of the sectionalism.
