Classify the algae volvox, ulva, and chlamydomonas based on their cellularity. unicellular: volvox colonial: chlamydomonas multicellular: ulva unicellular: ulva colonial: chlamydomonas multicellular: volvox unicellular: chlamydomonas colonial: volvox multicellular: ulva

Unicellular would be known to be Chlamydomonas 

Volvox would be in a "colonial" organization.

Ulva would be multicellular.

Just by understanding this, we would have to point out from your option which one would be relative to our understanding above, and therefore, your answer would then be the following.

Your correct answer would be the last option, as it would read:

unicellular: Chlamydomonas colonial: Volvox  multicellular: Ulva.

Your Last option.