Which of the following is an economic reason that the south needed a reconstruction plan?
a. former plantation owners took back their land.
b. the civil war caused most people to move north.
c. plantations, factories, and other businesses were destroyed during the war.
d. southern states threatened again to secede.

c. Plantations, factories, and other businesses were destroyed during the war.  

Explanation:

It needed to be rebuilt to help put the south back as part of the Union.  

To Attain this restrictions were made such as promises to be loyal to the United States.  

- "the past is made of multitudinous items ranging from anything that can be collected, recollected or assessed to originate in the past. as such, the past is a gallimaufry of particulars that may not have been related in any way. however, the human mind seeks organization to understand concepts and other things. the human mind therefore seeks relationships in explaining and studying the past. history being a humanity, dictates that historians have to serve this human trait by bringing structure to details of the past. historians do this by creating interpretive frameworks that capture as many details as possible."

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i would go with the last one