Strontium-90 is a dangerous substance that is released in nuclear weapon fallout. However, under controlled conditions, it can be used to treat bone cancer, and it can also be used as a radioactive tracer in medical and agricultural studies. If a scientist has 10 g of
strontium-90, how many grams will remain after 3 half-lives?
OA. 11.25 grams
OB. 10 grams
OC. 5 grams
OD 1.25 grams

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.

Well technically there are two correct answers b and d. but for you its probably b in general.good day sir/ma'am : ) (i know not gender)