Ascientist finds what she thinks is a new species of rodent on a small pacific island. however, some similar-looking rodents inhabit some nearby islands. she mates the new rodent with the nearby rodents and gets viable but infertile offspring. why? a) the new rodents probably derive from fairly recent ancestors that experienced dispersive allopatric speciation
b) the old and new rodents underwent vicariance, and they hybrid offspring were sterilized by adaptive radiation
c) the new and old rodents are both allopolploid are undergoing sympatric speciation
d) none of the above