Answer:
The correct answer is "renewable feedstock."
Materials made from agricultural products or the wastes of other processes are often referred to as "renewable feedstock." These materials are considered "renewable" because they are derived from sources that can be replenished naturally or through farming. Examples of renewable feedstocks include crops such as corn and soybeans, as well as agricultural wastes like corn stalks or wheat straw.
In the context of chemistry and chemical production, renewable feedstocks are often used as sustainable alternatives to fossil fuels or other non-renewable resources.