Clearing land is not a sustainable practice in any form, so not A. Crop rotation is important for maintaining soil fertility, but is not necessarily sustainable. It's definitely not C. It is likely D because using only renewable resources is top notch sustainability.
The answer is letter A. The entire population of the species
spends winter in Oyamel
Oyamel is one of the most popular places where Monarch
butterflies would breed over winter season. But because of deforestation and
climate change there was a big decline on the number of monarch butterflies
going to Mexico and back over the past few years.
