it's C because,
Nat Turner's Rebellion was a slave ... The state executed 56 slaves accused of being part of the rebellion, and many ... He witnessed a solar eclipse on February 12, 1831 and was convinced that it ... alarm led to whites' attacking blacks throughout the South
The answer is the North Vietnamese took over the South Vietnam spreading communism Southward and this proved the domino theory (if one country come under the influence of communism, the surrounding countries would follow).
The third option is the correct answer.
Thee answer is D, hope it helped
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