In the United States, how many years are required to convert a traditional farm into an organic farm?

The correct answer is C. 3.

In the United States, a farm must undergo a transitional period of three years to be certified as organic. During this time, the farm must adhere to organic farming practices and cannot use prohibited substances, ensuring that the soil and land meet organic standards before certification. If you have more questions or need further clarification, feel free to ask!