That's A, President Franklin D. Roosevelt. The topic you're asking about is extremely important. I would delve into a bit more research. I can't remember why FDR but I did the test a while back and got an A.
A. In the early 1900s
According to australia.gov.au :
"Australia became an independent nation on 1 January 1901 when the British Parliament passed legislation allowing the six Australian colonies to govern in their own right as part of the Commonwealth of Australia".
Answer:
D= LARGE PLANTATIONS' RELIANCE ON SLAVE LABOUR.
Simón Bolívar, byname The Liberator or Spanish El Libertador, (born July 24, 1783, Caracas, Venezuela, New Granada [now in Venezuela]—died December 17, 1830, near Santa Marta, Colombia), Venezuelan soldier and statesman who led the revolutions against Spanish rule in the Viceroyalty of New Granada.
Venezuela is the answer. :)