2. Part A: How does the author mainly advance the theory that is proposed point
in paragraph 3? *
3
But anthropologists think that a few foods made the 5,000-mile trek across the
Pacific Ocean long before Columbus landed in the New World. And their proof is
in the potato—the sweet potato
A. by criticizing the popularity of a competing theory
B. by acknowledging that the theory might be hard to believe
C. by suggesting that the theory can explain multiple mysteries
D. by citing a wide variety of findings that help prove the theory