During wartime, many items were invented or improved due to the need to replace rationed materials. Among the choices you've provided, the common item that was invented during the war to address the need for alternatives is synthetic fabrics.
Synthetic fabrics, such as nylon, were developed during World War II to replace silk, which was rationed and needed for military use. Antibiotics were discovered earlier, color televisions were developed after the war, and computers evolved significantly during and after the war but were not specifically invented to replace rationed items.
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