How does paragraph 1 shape MacArthur’s message to the cadets in the speech?
A. MacArthur discusses change and the expanding reach of humanity, but announces to the cadets that their duty as soldiers will remain the same.
B. MacArthur discusses change and the expanding reach of humanity, and so provides context for the cadets as to how their roles as soldiers will change over time.
C. MacArthur talks about exploring the universe and many exciting discoveries, which he doesn’t think he’ll live to see but hopes the cadets will.
D. MacArthur talks about humanity’s expanding understanding of the scope of the universe, giving the cadets perspective on their relatively minor place in it.

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