Answer :
The similarity between the Iroquois and Cherokee was that they both practiced slash-and-burn agriculture. Hence, Option C is correct.
What is slash-and-burn agriculture?
A method that is widely opted for and used by the farmers for growing the food. The use of this method is done mainly in such areas that are wild or for land that was earlier forested land but is now clear cut and any remaining vegetation burned.
The after-effects of this method of agriculture are that a layer of ash provides the newly-cleared land and this layer is quite rich in nutrients that help to fertilize crops. In other terms, it is a kind of agriculture that involves cutting and burning plants. This is done on the land of either forest or woodland to produce a swidden field.
Thus, Option C is correct.
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