Identify the grand canal.

The Grand Canal forms a vast inland waterway system in the north-eastern and central eastern plains of China, passing through eight of the country's present-day provinces. It runs from the capital Beijing in the north to Zhejiang Province in the south.

Explanation:

c) troops march forward in close formation against newer, more accurate weapons

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b gas tractor

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c and negotiated lower prices for farm equipment and supplies

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d the grange

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c over 15,000 bankrupt businesses

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c people became more self-sufficient