49. A. Research also suggests that regular consumption may improve blood flow to the brain. B. Many health experts thus recommend a small daily portion as part of a balanced diet. C. Dark chocolate is often praised by nutritionists for its high concentration of antioxidants. D. These substances, known as flavonoids, help protect the body's cells from damage. E. Such a boost in circulation can lead to better performance on memory and concentration tests.
(A) CDAEB
(B) CBEAD
(C) CEADB
(D) CADBE