Answer:
A. Population; the number of people in a geographic area.
B. Gene pool: the total number of genes of every individual in a population.
Step-by-step explanation:
These are arranged as:
A. Population, a group of interbreeding individuals.
B. Gene pool: the sum of all genes in a population, sum of most common genes in a population, the source of genetic information from which the next generation is produced.
C. Neither of the two : a group of individuals of different species.