转基因大米是中国公众非常关心的问题之一，反对转基因的人认为其存在不可预测的危害性，而支持转基因的人则称，转基因可以为公众带来很多切实的好处，在这种情况下，一则关于黄金大米的报道，引发了社会的广泛关注。一位从事转基因研究工作的科研人员称，富含胡萝卜素的转基因大米可以有效缓解因缺乏维生素A而引起的失明，一旦推广可以挽救许多失明儿童。
以下哪项如果为真，最能削弱该科研人员的观点（ ）
【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.
世界末日期间，一群人被丧尸追赶，他们中有A特警，带了a1和a2两个学徒，B特警，带了b1和b2两个学徒，神秘人士C，带了一只神秘怪兽。现在他们被逼到了一条河上，河上有一艘汽艇，但是一次只能做2个人。
现在问题来了：
1.只有A,B,C会开汽艇
2.A和B有过节，一有机会就会杀对方的学徒（A不在，B就会杀掉a1，a2。同理，对B一样）
3.C不在，神秘怪兽会发狂，通杀全部。
现在怎么让大家都安全渡过河？
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