Which shows the levels of organizational hierarchy listed from least complex to most complex? organism, species, community species, ecosystem, community population, community, species organism, community, population

The answer is A. organism, species, community.

Organizational hierarchy is the hierarchy of complex biological structures. From least complex to most complex the order is as following:
atom, molecule, organelle, cell, tissue, organ, organ system, organism, population, species, community, ecosystem, biome, biosphere.
So, A is the right choice:
Organism is the basic living system. The higher level is species - a group of organisms that are able to reproduce. The higher level is community - an interspecific group that includes interacting populations.

The answer is b. hope this !