The correct answer is D: Democrats being elected governor year after year, and not just governor, but also they had control over the houses in the legislature.
This total control from the Democratic Party over Georgia´s politics lasted from 1872 till 2002, when things changed in favor of Republicans.
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The Democratic Party gained a foothold on the control of most of the states of the Deep South basically because they offered Southerners an alternative to what Republicans were enforcing everywhere; a breaking of segregation and discrimination against African Americans.
Because Southerners opposed to these measures that were being presented by Republicans, and since the Democrats offered alternatives to this, fighting for the rights of each state to follow their own laws and regulations as they saw fit, since they protected and believed in the status quo in the South, Southern states, and mostly Georgia, voted for them for more than a century.
This started to change around 1948, when Southerners began to see a change in the policies of the Democratic Party at large, and the Democrats of the South decided to break off for a bit and created the States Right Democratic Party, which continued to support segregation.
Republicans reached power in Georgia when Republican Sonny Perdue won the gobernor seat in 2002 against Democrat Roy Barnes