The correct answer is option 4, China. China is the largest producer of apples in the world. China`s favorable climate, large agricultural land, and advanced farming practices contribute to its high production of apples. China`s apple industry has experienced significant growth over the years, making it the leading producer globally. The country`s vast agricultural resources and government support for fruit production have helped China maintain its dominance in the apple market. Although other countries, such as the United States, India, and Russia, also produce apples, they do not surpass the production levels of China. Therefore, option 4, China, is the correct answer for the greatest producer of apples in the world.