Which of the following product innovations, initially designed for civilian use, was rapidly adapted for military purposes during World War I and fundamentally changed battlefield mobility?

Throughout military history, certain product innovations have dramatically transformed battlefield tactics and strategy. From ancient siege weapons to modern surveillance technology, these innovations have often decided the outcomes of major conflicts. This trivia poll tests your knowledge about one such revolutionary product development that had an enormous impact on military operations and doctrine. Can you identify which product innovation truly changed the course of warfare?

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The Caterpillar Track System (used in tanks), originally developed for agricultural tractors by Benjamin Holt in 1904
The Aluminum Canteen, originally designed for wilderness explorers by the American Flask & Cap Company in 1908
The Wristwatch, originally marketed as women's jewelry before being adapted for coordinated trench warfare operations
The Zippo Lighter, initially created for civilian smokers but modified with windproof features for battlefield use