Answer:
OD
Explanation:
OA: A web site could be useful for a quick answer but not a very accurate one. Especially since these people arent certified in food.
OB: A book sounds like a very credible place to look for answers but this book is more about personal experiences in diets and isn't certified in food.
OC: An article sounds like a very credible source but is from a person who studied food related problems, meaning that what they have studied isnt as official as an actual certified worker in food.
OD: The most credible source for Ray to choose would be a book on gluten-free diets by an author who has two degrees in nutrition and works at the University of Rockingham. 
 
        
             
        
        
        
Answer:Two very interesting points; I’d say you’ve learned much already. Now to just harness that energy; study something you genuinely like - after what has been shown to be most helpful first.
Explanation:
 
        
                    
             
        
        
        
Since is objective should not include the writer’s opinion and include only facts from the text.