Which of these military innovations was widely deployed but then massively recalled during World War II due to critical design flaws that endangered troops?

Throughout military history, many weapons and equipment were recalled due to catastrophic failures or design flaws. These product recalls not only cost millions but sometimes cost lives on the battlefield. Test your knowledge about one of the most significant military equipment recalls that changed how military procurement operates to this day. Can you identify which of these military innovations was recalled en masse after deployment?

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The Ross Rifle, which would jam in muddy conditions and could fire when the bolt was partially open, causing serious injuries to Canadian soldiers
The M1 Garand rifle, which was recalled after the 'ping' sound of its ejecting clip alerted enemy soldiers
The P-51 Mustang fighter plane, which had a critical fuel system flaw causing mid-air explosions
The Sherman tank's initial model, recalled after its armor proved too thin against German anti-tank weapons