Final answer:
Answer 'B. and GNI/capita are necessary for estimating consumption' is correct, as population size must be coupled with economic indicators like GNI or GDP per capita for accurate consumption estimation. This combination accounts for both potential market size and the economic strength or purchasing power of the population.
Step-by-step explanation:
Based on the information given, the correct answer to the question of whether population size will provide a basis for estimating consumption of low-priced, mass-consumption products would be 'B. and GNI/capita are necessary for estimating consumption of low-priced, mass-consumption products such as soap and soft drinks.' This is because, while population size gives an indication of potential market size for a product, it doesn't provide insight into the economic strength or purchasing power of that population. For a more accurate estimate of consumption, one would need to consider the Gross National Income (GNI) per capita, which gives an indication of the average income, and therefore the likely spending ability, of individuals in that population.
GNI and GDP are used to gain insight into global stratification based on a country's standard of living. Different income levels in countries affect the citizens' access to amenities which in turn impacts the level of development and the capacity for consumption of nonessential goods. Therefore, combining population data with GNI or GDP per capita can provide a more comprehensive picture of consumption patterns for low-priced, mass-consumption products.