The correct answer to this open question is the following.
Although you forgot to include the options to answer this question we can comment based on our knowledge of the topic.
Minority groups and women contributed to WWI abroad in the following ways. This contribution impacted life for them at home in America too,
Minority groups and women could join the armed forces.
Women were hired to do jobs traditionally done by men because men joined the armed forces and had to go to Europe to fight in the war front. Women and other minority groups filled those vacancies in the fabrics to still producing weapons and the war supplies needed to send to the battlefield.
Of course, this facilitated minority individuals to find jobs more easily in different industries. Historians consider that approximately one million African American soldiers fought.
So the participation of the United States in World War I opened the opportunity to women and minority groups that had been relegated by the US industry in the previous years of the war.