The statement in option (d) is correct. Rest statements are incorrect and can be corrected as ∙ Cellular organisation of the body is the defining feature of living forms. ∙All living organisms have the ability to sense their surroundings and respond to various stimuli and are thus aware of their surroundings, i.e. show consciousness. ∙ A patient with dead brain has no consciousness (as brain is the main controlling organ of the body) and hence is considered to be dead.