How do chlorofluorocarbons (cfcs) contribute to ozone depletion? a. chlorine atom (cl) breaks apart the ozone molecule b. cfcs build up and block the filtering effects of the ozone layer c. chlorine atom (cl) bonds to the ozone molecule and changes its chemical properties d. breaks off an oxygen atom (o) and attaches it to a hydroxide ion (oh) to form water select the best answer from the choices provided a b c d