(B) The Vital index is defined as the ratio of natality (birth rate) to mortality (death rate) multiplied by $100$.It is used to determine the growth

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(B) The Vital index is defined as the ratio of natality (birth rate) to mortality (death rate) multiplied by $100$.It is used to determine the growth potential of a population.The formula is:Vital index $= \frac{\text{Natality}}{\text{Mortality}} \times 100$Therefore,the correct option is $B$.