TOEFL Reading: ETS-TOEFL阅读机经 - 3858OE6S76S1521HL$

How does paragraph 5 relate to paragraph 4 A. Paragraph 5 shows that the food-desert theory introduced in paragraph 4 can account for only part of what needs to be explained. B. Paragraph 5 explains why the author calls the theory set out in paragraph 4 the food-desert theory. C. Paragraph 5 completes the account of the food-desert theory begun in paragraph 4. D. Paragraph 5 outlines an alternative to the food-desert theory described in paragraph 4.