Choice Ahoice C is the correct answer.

1. Start with the equation: $5(x - 3) = 20$
2. Divide both sides by 5: $x - 3 = 4$
3. Add 3 to both sides: $x = 7$
4. Verify: $5(7 - 3) = 5(4) = 20$ ✓

Choice Ahoice D is incorrect because this results from subtracting 3 from 4: $1$. Wrong inverse operation.

Choice Ahoice C is incorrect because this is the value of $x-3$.

Choice Ahoice B is incorrect because this results from adding 3 to 20: $23$.