The allied powers included

a. germany, austria-hungary, the ottoman empire, and eventually bulgaria

b. germany, austria-hungary, and eventually italy

c. france, great britain, germany, and eventually the ottoman empire

d. france, great britain, russia, italy, and eventually the united states

Reasons for joining WWI:Serbia (Dispute over Balkans)
Russia (Allied with Serbia)
Great Britain (Allied with Belgium)
France (Allied with Russia)
Belgium (Germany invaded to get to France)so the best answer is D

if you wanna know the Axis, and centeral here ya go

Reasons for joining WWI:Austria-Hungary (Dispute over Balkans)
Germany (Allied with Austria-Hungary)
Bulgaria (Allied with Germany)
Ottoman Empire (Allied with Austria-Hungary)

Neutral:Italy (Entered war in 1915 as an Allied Power)
United States (Entered war in 1917 as an Allied Power)
Spain
Netherlands
Norway
Sweden
Switzerland

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.