Choice Dhoice C is the correct answer.

1. Start with the equation: $8x - 12 = 20$
2. Add 12 to both sides: $8x = 20 + 12$
3. Simplify: $8x = 32$
4. Divide both sides by 8: $x = \frac{32}{8}$
5. Simplify: $x = 4$
6. Verify: $8(4) - 12 = 32 - 12 = 20$ ✓

Choice Dhoice D is incorrect because this results from subtracting 12 from 20: $20 - 12 = 8$, then $8/8 = 1$. We must add to undo subtraction.

Choice Dhoice C is incorrect because this is the value of $8x$. Don't stop early!

Choice Dhoice B is incorrect because this results from multiplying 32 by 8: $32 \times 8 = 256$.