Which nonmetallic minerals are most likely to be of high market value? a) platinum b) silver c) gemstones d) gold

Option C and D, birth rate and death rate

Explanation:

Considering the fact that birth and death among the given options are natural factors that affect the population of any country, both of these factors thus contribute to the natural population growth of a country.  

The natural increase in population of any country is equal to the difference between the birth and death rate of the nation.  

Natural increase in population   Death rate Birth rate

For example if birth rate of any nation is and death rate is , then natural increase is equal to