After 3 years, the substance will go through 4 half lives. You can do 230*(1/2)^4, which is 14.375.
I think the answer is white sand (sorry if i am wrong)
Heat transfer is the phenomenon that occurs when the two objects are in the vicinity of each other and by increasing the area of their contact. Thus, option B is correct.
<h3>What is heat transfer?</h3>
Heat transfer is a process that flows the heat from one system to another, and is because of the difference in the temperature of the two objects that are part of the system.
The methods like conduction, convection, and radiation transfer the heat from the surface area to the other object. The heat gets transferred from the area of high to the low temperature.
Therefore, option B. by increasing the surface area the heat transfer increases.
Learn more about heat transfer here:
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= 
= 9.95 mL
x 100 
x 100 = 0.5 % error