Answer:
The correct option is C.
Explanation:
The given equation is

To solve this equation, we need to subtract 8 from both the sides and this property is known as subtraction property of equality.
According to the subtraction property of equality the equations a=b and a-c=b-c are equivalent.


Then the conclusion is

Therefore the correct option is C. Subtraction property of equality is used to arrive at the given conclusion.