When two related populations occupy
geographically or spatially separate areas, they
are called
a) Allopatric population
b) Quantum population
c) Saltational population
d) Parapatric population
plz explain

I guess the answer should be (a) Allopatric population as allopatric speciation is a phenomenon in which geographically isolated species are developed into distinct species.But due to absence of gene flow the population is genetically similar.