What does percent composition tell you about a substance? O A. It gives you the molecular formula of the substance.
O B. It gives you the total mass of the substance,
O C. It tells you what the substance is made of,
O D. It tells you how many moles are in the substance,

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.