Which series correctly lists the eight taxonomic levels in order, from the broadest group to the most specific group?

The correct answer is Domain, Kingdom, Phylum, Order, Class, Family, Genus, Species. There is nothing lower than species nor is there anything higher than Domains. Being of the same species means being able to sexually reproduce and successfully create healthy offsprings under regular conditions. That's why the Homo Sapiens species, or the humans, can't procreate with animals.