Which of these choices provides a direct refutation of an argument found in this passage, that viruses are not living organisms? a. since living things reproduce, and viruses reproduce, they must be alive. b. many bacteria become spores, highly protected inanimate forms, during times of stress. c. a baby can't survive without , just like a virus needs a host in order to reproduce. d. before changing into a butterfly, caterpillars go through a cocoon stage where they appear dormant?