The answer is C. Airplanes. All were used, but the other three were used as weapons.
I just did this hold on let me grab my answer rq then I can answer this
More than 9 million soldiers and an estimated 12 million civilians died in WW1, and 21 million military men were wounded
Thomas Jefferson<span>, </span>Alexander Hamilton, Henry Knox<span>,and </span>Edmund Randolph<span>.
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