Final answer:
The correct answer is option a) Harlem Hellfighters - Croix de Guerre.
Step-by-step explanation:
The Black infantry that won the French medal for bravery was nicknamed the Harlem Hellfighters. These courageous African American soldiers of the 369th US Infantry served with distinction alongside the French army during World War I. The entire regiment was awarded the Croix de Guerre, a French military decoration, to honor their valor in combat.
Despite facing segregation and discrimination, the Harlem Hellfighters showed exemplary heroism, particularly during key battles such as the second battle of the Marne and the Meuse-Argonne offensive.