Help please! I need an answer fast

Which of harriet martineau’s books is a foundational treatise on sociological data collection?

Which of these rose during the great depression?

Part a: which statement identifies the central idea of the text? a: the north was more powerful than the south and was always going to be the victor of the civil war. b: despite the obvious strength of the north, the outcome of the war was unpredictable at the time. c: the united states underestimated the strength of the south, giving it the upper hand. answer !