Questions: Net grain production is the difference between the amount of grain a country produces and the amount of grain its citizens consume. It is positive if the country produces more than it consumes, and negative if the country consumes more than it produces. The figure shows the net grain production of four countries in 1990 and projected for 2030. Complete parts a through c. a. Which of the four countries had to import grain to meet its needs in 1990? A. U.S. B. Russia C. China D. India b. Which of the four countries are expected to need to import grain to meet needs in 2030? A. U.S. B. India C. China D. Russia c. Given that India and China are the world's two most populous countries, what does this graph tell you about how world agriculture will have to change between now and 2030? A. It will need to decrease. B. It can stay about the same. C. It will need to increase.

To answer these questions, we need to analyze the net grain production data for the four countries in 1990 and the projections for 2030. Since the specific figures or graph are not provided, I will base my answers on general knowledge and logical reasoning.

a. The answer is C. China b. The answer is C. China c. The answer is C. It will need to increase.

• Option A: U.S. - The United States has historically been a major grain producer and exporter, so it is unlikely that it needed to import grain in 1990.
• Option B: Russia - In 1990, Russia (then part of the Soviet Union) had significant agricultural production, but it also faced inefficiencies. However, it was generally self-sufficient in grain.
• Option C: China - China, with its large population, has often faced challenges in meeting its grain needs, making it a likely candidate for needing imports in 1990.
• Option D: India - India has been a significant grain producer, but like China, its large population could have led to a need for imports in certain years. However, China is more likely to have needed imports in 1990.

• Option A: U.S. - The U.S. is expected to remain a major grain exporter by 2030.
• Option B: India - While India has a large population, it has made significant strides in agricultural production and is less likely to need imports compared to China.
• Option C: China - With its large and growing population, China is expected to continue needing grain imports by 2030.
• Option D: Russia - Russia has the potential to be self-sufficient or even an exporter due to its vast agricultural land.

• Option A: It will need to decrease. - This is unlikely given the growing global population and increasing food demand.
• Option B: It can stay about the same. - This is not feasible as the demand for food will increase with population growth.
• Option C: It will need to increase. - To meet the needs of growing populations, especially in populous countries like India and China, global agricultural production will need to increase significantly by 2030.