The correct answer is option 4 - Ukraine. The "Orange Revolution" is associated with Ukraine.

To understand why this is the correct answer, let`s look at the other options:

Option 1 - Brazil: The "Orange Revolution" did not occur in Brazil. Brazil is known for other significant events and movements, such as the "Brazilian Revolution" in 1930, but not the "Orange Revolution."

Option 2 - Sudan: The "Orange Revolution" also did not take place in Sudan. Sudan has had its share of political turmoil and conflicts, but the term "Orange Revolution" is not connected to Sudan.

Option 3 - Turkey: Turkey is not the correct answer either. While Turkey has had various political transformations and movements, none of them are referred to as the "Orange Revolution."

Therefore, option 4 - Ukraine is the correct answer. The "Orange Revolution" refers to a series of protests, demonstrations, and political events that took place in Ukraine in late 2004 and early 2005. These events led to a change in government and marked a significant turning point in Ukrainian politics.