A student fills two glass bottles with equal amounts of water and then attaches a balloon to the top of each bottle. The bottle on the right is heated on a hot plate to 80 degrees Celsius (176 degrees Fahrenhek), while the bottle on the left is kept at room temperature, 21 degrees Celsius (70 degrees Fahrenheit). After several minutes the student observes that the balloon on the right inflates

The answer should be c.

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.