【正确答案】 C

【答案解析】[解析] 事实细节题。原文第三段第二句中说the result of insider manipulation is that the market puts them at an exaggerated disadvantage to the big commercial feedlots who could hedge at the lower cost level，因此牲畜产业中期货的风险来自于内部人士控制商品的市场价格。