Final answer:
The Division Property of Equality is used to find X = 10 in the given equation. Hence the correct answer is option D
Step-by-step explanation:
The property used in the last step to find X = 10 is Division Property of Equality. In the equation, 8X = 80, we want to isolate X, so we divide both sides of the equation by 8. This gives us X = 10.
Hence the correct answer is option D