Who were the Harlem Hellfighters?

A. an African American Jazz Band that first appeared in New York City during the 1920s

B. an organization of African American intellectuals that fought against segregation

C. an African American women's groups that rallied for sufferage rights

D. an Infantry Regiment of African-American soldiers that served in World War I

D. an Infantry Regiment of African-American soldiers that served in World War I.

Explanation:

The Harlem Hellfighters was an infantry regiment of the New York Army National Guard during World War I and World War II. Its official name was the 369th Infantry Regiment, and it was composed of African Americans. During World War I, this regiment spent more time in combat than any other American unit. They also suffered the most losses of any American regiment.

The correct answer is D, an Infantry Regiment of African-American soldiers that served in World War I

Explanation:

The 369th Infantry Regiment was their actual name, formerly known as the 15th New York National Guard Regiment but they were soon nicknamed the Harlem Hellfighters. They spent more time in combat than any other American unit.