Both plants and animals are eukaryotic, meaning they contain a nucleus with genetic information, so that crosses out A.
I don't know what motile primary consumers are. Assuming, they're primary consumers, primary consumers are those that eat producers, so in this case, this would elminate B.
Both plants and animals are multicellular.
Plants ARE autotrophic, meaning they produce their own food. Animals, however, have to get their own food, either by hunting or scavaging.
