The statement that best evaluates how geography affects diversity within political parties and political outcomes is:
C) States such as Kansas, Nebraska, North Dakota, Oklahoma, South Dakota, and Texas tend to be strongly Republican, limiting diversity.
This option correctly identifies a region of the United States that is predominantly Republican and suggests that this political alignment limits diversity in terms of political viewpoints and party representation within those states. Other options incorrectly label states that are known for having more diverse political landscapes or are considered strongholds for Democratic parties.