Which revolutionary supply chain innovation, nicknamed the 'Red Ball Express,' was critical to Allied success following the D-Day invasion in 1944?

While battles and generals often dominate military history discussions, the complex supply chains behind major conflicts have determined the outcome of wars throughout history. During World War II, the ability to supply troops with equipment, ammunition, food, and fuel across vast distances proved crucial to Allied victory. This trivia question focuses on one of the most remarkable supply chain innovations that helped turn the tide of the war.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

A dedicated truck convoy system that delivered over 12,500 tons of supplies daily to advancing Allied forces
A specialized railway network built by engineers to transport tanks and heavy artillery across France
An aerial supply drop system using modified B-17 bombers to deliver provisions to forward units
An underwater pipeline system that pumped fuel across the English Channel to support mechanized divisions