Answer:
B. demand for high-fiber foods will decrease.
Explanation:
If two research concludes that increased fiber in the diet does not reduce the risk of cancer development which was assumed previously than it will affect the demand of high fiber food.
The demand of high fiber food will decrease because many people were taking the high fiber food because of its medicational property of preventing cancer. So after this report, these people will reduce buying the high -fiber food which will result in reducing demand for high fiber food. Therefore the right answer is B.