<em>a documentray video</em> would be the best option. i diagram can be the first one taken away because a diagram won't be effective if you would want to include armstrong's music. an essay is another option that can be taken away as well, since an essay won't be effective for showcasing armstrong's music as well. radio program would be the last option taken away. as a student who is doing a project, a documentary video seems the most realistic for a student. radio programs would most likely be unatainable to a student.
so, your answer would be <em>c.) a documentary video</em>
