Question

which of the following was a result of the selective service act? *
african americans could no longer serve in the military
women were now allowed to serve in all combat positions
military troops were now segregated by race
men aged 21-45 were required to register for military service

Explanation:

The Selective Service Act (1917) established a draft system for U.S. military service during WWI, requiring men in the specified age range to register. The other options are incorrect: African Americans served in the military, women were not allowed in all combat positions at this time, and racial segregation in the military predated this act.

Answer:

Men aged 21-45 were required to register for military service