The correct answer is A) Discrimination against Jews increased as a result of growing nativist sentiment.
The United States’ entry into World War I impacted Jewish Americans in that discrimination against Jews increased as a result of growing nativist sentiment.
The United States decided to leave behind its policy of neutrality and enter World War 1 after the interception of the Zimmerman's telegram where the Germans asked Mexico for help, and after the sinking of the Lusitania, ship by the German navy. The United States entered World War 1 on April 6, 1917.
In those moments, Nativism in the United States increased its presence and white Americans started to discriminate immigrants, including Jewish people. The Nativist sentiment made white Americans to demand preference over immigrants.
The other options of the question were B) Jews enlisted in the army in larger numbers than other groups. C) Many Jews converted to Christianity to show support for the war effort. D) Discrimination against Jews declined as a result of their service.