C. insufficient D. unequal 8. What does the word "this" refer to in line 13 A. using protein supplies for energy B. converting carbohydrates to energy C. having a deficiency in carbohydrates D. having an insufficient amount of protein carbohydrates? 9. According to the passage, which of the following does NOT describe A. a protein supply B. a necessity C. a range of sugars D. an energy source