The image, in which A represents a gene, shows a harmless mutation that has occurred in a species' genome. Which is the most plausible way that this mutation may eventually benefit the species?

A)
Multiple copies of genes increase gene expression and protein synthesis,
improving fitness

B) One copy of the gene may mutate further and begin to function differently
from the original.

C) Individuals with different copy numbers of the gene will not be able to
mate, resulting in speciation.

D) Individuals with the mutation are not able to produce offspring and will be removed from the gene pool.