9) B

A – Wrong 
A gene pool consists of all of the alleles within an individual. Natural selection refers to the survival of individuals with and advantageous gene (or alleles within a gene) but not a gene pool.

B – Correct
This is correct. Individuals with advantageous allele will be favoured by natural selection.

C – Wrong 
A high reproductive capacity does not necessarily mean that it will have the advantageous allele needed to survive in its environment.

D – Wrong
Geographic distribution is not relevant in natural selection.

E – Wrong 
Geographic distribution is not relevant in natural selection.