Answer D is false. The germans used a ton of airplanes for their Blitzkrieg tactic. Allied bombers hurt the german economy, crippling their war macine. And most of the pacific victories of the US against Japan, such as the sinking of the yamato, was mostly because of the air force the US possesed.
it is C) important railroad tracks were destroyed, severing supply lines for Confederate forces.
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The answer would be C.
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Because transportation movements were expensive
