Read the article Watering Livestock with Renewable Energy. Why does it make sense for ranchers to use renewable energy to pump water?
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O Animals do not need water during the summer.
O In most of the United States, there is not enough wind to run pumping systems.
O Solar energy is strongest in the winter, when water is needed for animals and crops.
O Wind and solar energy help save money and reduce air pollution.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.