Which of the following was true of the Song dynasty? The Grand Canal was completed New techniques expanded agriculture. New granaries were built to protect the supply of tea. Tea became China's staple crop.

The Song dynasty, which ruled from 960 to 1279, was a time of significant advancements in agriculture. One of the key developments was the introduction of new agricultural techniques and the use of early-ripening rice, which allowed farmers to harvest more than two crops a year, greatly increasing food production. Additionally, the Grand Canal, which facilitated trade and transport between northern and southern China, saw substantial enhancements during the Song dynasty. This impressive feat of engineering helped to solidify the dynasty's economic power and is still the longest canal in the world today!