Researchers Have Been Studying a Rare Population of 87 Voles

Researchers have been studying a rare population of 87 voles in an isolated area.Ten voles from a larger population were added to this isolated population.Besides having 10 additional animals,what benefits are there to importing individuals?

A) Additional animals from a distant population will likely bring genetic diversity and reduce inbreeding depression.
B) Additional animals will bring additional competition and could hurt the population.
C) Additional animals would increase beneficial genetic drift.
D) There is no benefit other than increasing the overall population size.