【专题 GMAT逻辑题】

Maize contains the vitaminniacin, but not in a form the body can absorb. Pellagra is a disease thatresults from niacin deficiency. When maize was introduced into southern Europefrom the America in the eighteenth century, it quickly became a dietary staple,and many Europeans who came to subsist primarily on maize developed pellagra.Pellagra was virtually unknown at that time in Americas, however, even among peoplewho subsisted primarily on maize.        

Whichof the following, if true, most helps to explain the contrasting incidence ofpellagra described above?        

(A)Once introduced into southern Europe, maize became popular with landownersbecause of its high yields relative to other cereal crops.        

(B)Maize grown in the Americas contained more niacin than maize grown in Europedid.        

(C)Traditional ways of preparing maize in the Americas convert maize’s niacin intoa nutritionally useful form.        

(D)In southern Europe many of the people who consumed maize also ate niacin-richfoods.        

(E) Before the discovery of pellagra’slink with niacin, it was widely believed that the disease was an infection thatcould be transmitted from person to person.