Discussion
Between 1951 and 1999, the death rate and infant mortality rate have fallen by
Answer: B
The death rate fell by more than 3 times and the infant mortality rate by more than 2 times, so the answer is B.
The excerpt gives the death rate as 25.1 per thousand in 1951 and 8.1 per thousand in 1999, and infant mortality as 148 per thousand falling to 70.
\[ \frac{25.1}{8.1} \approx 3.1 \]
\[ \frac{148}{70} \approx 2.1 \]
So the death rate fell by a factor a little above 3 and infant mortality by a factor a little above 2. Option A swaps the two, and option C claims 3 times for both, which is wrong for infant mortality.
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