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(b) is the right answer. The greater prevalence of environmental factors that positively affect longevity is responsible to some extent for the higher life expectancy in Bihar. Therefore, B is the best answer.
If life expectancy in Bihar is going to fall, as A says, the argument is weakened rather than strengthened.
C merely provides data which is irrelevant to the argument.
D is irrelevant because the information it mentions about rates would already have been accounted for in the data provided in the passage.
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