What did the Selective Service Act accomplish?

It required Allies to buy supplies with cash.

It organized war volunteers.

It conscripted, or drafted, soldiers.

It contracted businesses to make planes.

The Selective Service Act was enacted in 1917 and it gave authorization to the federal government of United States to form up a National Army through conscription that can provide its services in the World War 1. The US army was small at the time it jumped into war so the Selective Service Act asked the males aged 21 to 30 to join army. Later on, this age limit was changed to 18 to 45.

Therefore the correct answer to this question is third option:

It conscripted, or drafted, soldiers.