The bacteria are the simplest single cells that are capable of carrying out all the basic life activities. The bacterial cells do not contain all the cell parts and organelles, and are not among the most highly organized organisms. Still, these cells are perfectly able to perform all life activities. that are necessary to survive. The bacterial cells are prokaryotic, which means they have no membrane bound nucleus or organelles.
Hence, the answer is 'option B - carry out all life activities'.