Drought is caused by weather patterns, but is worsened by human activities. Choose two most likely reasons the author included the sentence in the passage.

Answer choices for the above question

to explain the recent surge in China's attention to ecology

to describe the cause of food shortages in areas of China

to establish that industries are responsible for the condition of the Yellow River

to establish that the condition of the Yellow River is connected to farming practices

to substantiate the formation of the Loess Plateau Watershed Rehabilitation Project