Correct answer choice is :
B) Burning down forests to clear land for planting crops
Explanation:
From the late eighth through the end of the ninth century, something strange occurred to wave the Maya civilization to its foundations. One by one, the Classic cities in the southern lowlands were broken, and by A.D. 900, Maya civilization in that region had dropped. The Maya culture was a Mesoamerican civilization advanced by the Maya peoples.
