The phrase that should be written in the column titled "Sometimes" is "Display an asymmetrical body plan."
This is because not all animals exhibit an asymmetrical body plan; some are symmetrical (e.g., bilateral or radial symmetry), while others may display asymmetry only at certain life stages or forms. The other options listed (multicellular, having membrane-bound organelles, and producing their own food) are characteristics that are generally true for all animals or specific categories of them.