Which revolutionary military product innovation was initially marketed as "an army in a box" to skeptical government officials before becoming widely adopted during World War I?

Throughout history, military technology has evolved through revolutionary product innovations that changed the course of warfare. Many of these innovations initially met resistance from traditional military establishments before proving their worth on the battlefield. This poll tests your knowledge about how certain military innovations were marketed and introduced to skeptical military leaders and governments - a fascinating case study in product innovation and brand storytelling.

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The tank, promoted by Winston Churchill as a way to break trench warfare stalemate
The military aircraft, advertised by the Wright Brothers as a reconnaissance platform
The submarine, presented by inventor John Holland as an invisible naval weapon
The machine gun, demonstrated by Hiram Maxim as a force multiplier for infantry units