"How does land change temperature compared to water?" LAND heats up and cools down FASTER than water does.
WATER heats up and cools down FASTER than land does.
Water and land change temperature at the SAME RATE.
Water and land DON'T CHANGE temperature at all.
It's IMPOSSIBLE TO TELL whether water or land changes temperature faster.

It’s A. Land heats up and cools quickly then water

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.