A. an explanation based on prior scientific knowledge or observations
i just took the quiz and got the answer correct.
 
        
                    
             
        
        
        
<span>Since we are not able to get energy directly from the food we eat, a particular process needs to take place that converts molecules to Adenosine triphosphate, also known as ATP. This requires that the food first be broken down by being digested. As digestion takes place, the body uses the small molecules to make ATP.</span>
        
             
        
        
        
Sometimes you mix different substances and you don't  make  new substances but mostly of the time you do make new substances , so the answer is chemical change.