Never in the nation' s history had Americans worked harder for victory than in the Civil War. Northerners and Southerners alike threw themselves into the task of supplying their respective armies. Both governments made tremendous demands upon civilians and, in general, received willing cooperation.
By 1863 the Northern war economy was rumbling along in high gear. Everything from steam boats to shovels was needed and produced. Denied Southern cotton, textile mills turned to wool for blankets and uniforms. Hides by the hundreds of thousands were turned into shoes and harness and daddies; ironworks manufactured locomotives, ordnance, armor plate. While private enterprise lagged, the government set up its own factories or arsenals. Agriculture boomed, with machinery doing the job of farm workers drawn into the army.
In short, everything that a nation needed to fight a modern war was produced in uncounted numbers. Inevitably there were profiteers with gold-headed canes and flamboyant diamond stickpins, but for every crooked tycoon there were thousands of ordinary citizens living on fixed incomes who did their best to cope with rising prices and still made a contribution to the war effort. Those who could bought war bonds; others knitted, sewed, nursed, or lent any other assistance in their power.
Which of the following is implied by the writer of this passage？

A. The students of the Civil War usually concentrate on the economy.
B. The families of the Civil War are extremely worded about their living.
C. The students of the Civil War usually concentrate on the battlefield.
D. The families of the Civil War are extremely worded about the government.