题目：Which of the following descriptions of the Cold Food Festival is correct?()
A. In ancient times, poor people did not have enough money to buy firewood for cooking food all year round and the Cold Food Festival was to encourage uncooked food.
B. People regard the Cold Food Festival and Qingming Festival the same.
C. To commemorate Jie Zitui, the lord ordered all fires in every home to be put out on the anniversary of Jie Zitui’s death. Thus began the festival, a day when no food could be cooked since no fire could be lit.
D. The festival is to commemorate Jie Zitui, a great hero who sacrificed his life in war.
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