Final answer:
To find the doubling time for the Democratic Republic of the Congo, the specific annual population growth rate is required. With this rate, the Rule of 70 or Rule of 72 can be used to estimate doubling time by dividing 70 or 72 by the growth rate percentage.
Step-by-step explanation:
To determine the doubling time for the Democratic Republic of the Congo, we would need the specific annual population growth rate for the country. However, since that information is not provided, I will explain how you can use information provided by the Rule of 70 or Rule of 72 to estimate doubling time with a known growth rate.
The Rule of 70 indicates that doubling time can be found by dividing 70 by the percentage growth rate. For instance, a growth rate of 2% would yield a doubling time of 35 years (70/2 = 35).
Likewise, the Rule of 72 suggests that you can estimate doubling time by dividing 72 by the annual percentage growth rate. This rule is often applied in finance to estimate the doubling time of an investment.
Using these rules, if you know the current population growth rate of the Democratic Republic of the Congo, you can calculate the approximate doubling time. Without the actual growth rate, we cannot directly answer the multiple-choice question provided.