A change in frequency of a gene in a given population leads to a change favoring expression of that gene within a population is referred to as genetic drift. Random fluctuations of alleles in a certain population can give a great chance of alleles being lost. This may lead to extinction of population if the change will continue. Although genetic drift can help fix alleles in a population, it can also result to extinction of a population if an allele will be loss extensively.
Genetic drift can cause a new population that is distinct from the original one. It can also lead to the emergence of a new species. Rare alleles can be lost in the process.
Answer - Option C - The emergence of a new species