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1000 CR TEST 11 Q.15

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by Rashmi1804 » Sat Apr 11, 2009 9:17 am
The level of lead contamination in United States rivers declined between 1975 and 1985. Federal regulations requiring a drop in industrial discharges of lead went into effect in 1975, but the major cause of the decline was a 75 percent drop in the use of leaded gasoline between 1975 and 1985.
Which of the following, if true, best supports the claim that the major cause of the decline in the level of lead contamination in United States rives was the decline in the use of leaded gasoline?
(A) The level of lead contamination in United States rivers fell sharply in both 1975 and 1983.
(B) Most of the decline in industrial discharges of lead occurred before 1976, but the largest decline in the level of river contamination occurred between 1980 and 1985.
(C) Levels of lead contamination in rivers fell sharply in 1975-1976 and rose very slightly over the next nine years.
(D) Levels of lead contamination rose in those rivers where there was reduced river flow due to drought.
(E) Although the use of leaded gasoline declined 75 percent between 1975 and 1985, 80 percent of the decline took place in 1985

OA:B

Could anybody explain why is E not a better option ???
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Source: — Critical Reasoning |

by cramya » Sat Apr 11, 2009 9:50 am
E talks about leaded gasoline decline but in no way helps us prove that this contributed more to the decline in contamination of rivers compared to industrial discharges. Not a relevant choice to strengthen the argument

b does this by saying that Most of the decline in industrial discharges of lead occurred before 1976, but the largest decline in the level of river contamination occurred between 1980 and 1985

This tells us that someting other than industrial discharges was the major reason for the lesser contamination in rivers and indirectly points to the decline in leaded gasoline usage.

Hope this helps.
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by graem83d » Sun May 15, 2016 3:17 am
i think it's E
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