The correct answer is d. All of the above are true.
Each statement presents a different perspective on how population growth can impact productivity:
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Statement a suggests that there is no definitive evidence that rapid population growth negatively affects natural resources in a way that would limit productivity. This implies that the relationship is still being studied and may vary based on context.
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Statement b points out that rapid population growth can lead to a dilution of capital stock (e.g., fewer resources per capita), which can lower individual productivity if the capital is not able to keep pace with population growth.
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Statement c posits that in some cases, rapid population growth could stimulate technological advancements, potentially increasing productivity as a response to the pressures of growth.
All these statements reflect different possibilities of how population growth can influence productivity, hence making option d the most accurate choice.