Okay, so overall, the unicellular (presumably bacterial) organisms are going to be the most similar when talking about genetic material as the genetic material doesn't have to code for as many proteins as it would in a multicellular organism. For example, in humans, our genome codes for every protein in every cell in every tissue in every organ in every system in your body. However, unicellular organisms have to code far less as they have a very limited amount of proteins that they actually have to form. You'll have some differentiation when it comes to diet, but overall, the answer should be organisms A and C.
