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Answer: C
Population in thousands
A. $40$ to $50$ is an increase of $\frac{10}{40}=25\%$
B. $50$ to $70$ is an increase of $\frac{20}{50}=40\%$
C. $70$ to $100$ is an increase of $\frac{30}{70}=42{6\over7}\%$
D. $100$ to $130$ is an increase of $30\%$
E. $120$ to $160$ is an increase of $\frac{40}{120} =33{1\over3}\%$