Most of the world's supply of uranium currently comes from the mines. It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that Uranium fetches on the world market. Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.
Which of the following would it be most useful to determine in evaluating the argument?
a. Whether the uranium in deposits on land is rapidly being depleted
b. Whether most uranium is used near where it is mined
c. Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater
d. Whether the total amount of Uranium in seawater is significantly greater than the total amount of uranium on land
e. Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater.
OA: A
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I was able to narrow down to A, C, and D
Ive convinced myself that 'technological advaces' to reduce cost was slighltly a shift of scope.
now, between A and D. I feel that they are almost synonymous in meaning. It would be important to know whether the uranium is being depleted (if not, then extracting from seawater is not needed). However, doesnt D) somewhat imply the same thing? If there isnt alot of uranium in the seawater to begin with, then the even the reduction in cost would not be worth it?
Am i thinking too much about this?
thanks.