The yes/no thing is basically the extreme test - answer each question with a yes / no and see how the answer effects the conclusion
Here its between A and C
A) If Uranium in land is depleted then we HAVE to extract from water - so conclusion shall fall
If Uranium in land is not being depleted - then conclusion stands fine.
C) If the cost of extracting Uranium becomes less than it what it costs currently - note : there could be in fact a $1 reduction ( and yet not violate the given condition) - however, a $1 reduction might not qualify uranium extraction from sea water. Hence, we cant conclusively prove anything from this.
Hence A
CR Gurus -> do let me know if my reasoning is flawed.
