Explanation:

- Option 1: India

- India is a major wheat producer, often among the top three globally.

- The country has vast agricultural areas dedicated to wheat.

- Option 2: China

- Correct Answer: China is the highest wheat-producing country in the world.

- China's extensive farmland and favorable conditions lead to high production.

- Option 3: Ukraine

- Ukraine is a significant wheat exporter but not the largest producer.

- Political and climatic factors impact its production levels.

- Option 4: Russia

- Russia is one of the top wheat producers and exporters.

- The climate in some regions is ideal for wheat farming.

- Option 5: Japan

- Japan imports most of its wheat.

- Limited agricultural land restricts large-scale wheat production.

In summary, China stands out as the top wheat producer globally, making Option 2 the correct choice.