Final answer:
The Democrats were the political group that won the 1869 elections and brought an end to military rule in the state, leading to a period known as 'redemption' in the South.
Step-by-step explanation:
In the 1869 elections, the group that won the day and ended military rule of the state was A. Democrats. This period marked a significant shift in the political landscape of the South, with the Democrats regaining control over state politics. By 1873, states like Texas had come under Democratic control, and this influence continued to spread to other states like Alabama and Arkansas in the following year.
The Democrats also made gains in national politics, especially noticeable during the 1874 elections, when they recaptured the House of Representatives for the first time since before the Civil War. The diminishing influence of the Radical Republicans and the withdrawal of federal troops from many southern states facilitated the Democratic victory. The term "redemption" was used by Southerners to describe the restoration of white supremacy and the end of what they saw as the oppressive rule by the Radical Republicans.