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正解に関係なくて、申し訳ないのですが1点質問があります。
お二方ともAをstrengthenで落としていますが、私にはこれもweakenに見えてしまいとても迷いました。
Aでは確かに少量は化学会社に売れているようですが、製造されたほとんどのligninsは廃棄物として焼却されていると言っていますが、結局worthless by-productのままで何の利益ももたらさないのでweakenとは言えないでしょうか？
A new technique for extracting residues of oil from existing oil wells by using lignins, a by-product of papermaking, is profitable provided that oil prices are over 20 dollars a barrel. Since oil prices are rising, investors looking for companies with prospects for rapid growth in profits would be wise to invest in paper manufacturers, whose currently almost worthless by-product will soon be a profit-boosting commodity.
Which of the following, if true, most seriously weakens the argument above?
A.A small quantity of lignins are currently sold by paper manufacturers to Chemical companies, but most of the lignins produced are burnt as waste.
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