Choice Bhoice C is the correct answer.

1. Start with the equation: $4(2x + 1) = 20$
2. Distribute the 4: $8x + 4 = 20$
3. Subtract 4 from both sides: $8x = 20 - 4$
4. Simplify: $8x = 16$
5. Divide by 8: $x = 2$
6. Verify: $4(2(2) + 1) = 4(5) = 20$ ✓

Choice Bhoice C is incorrect because this results from forgetting to distribute to the 1: $8x + 1 = 20 \rightarrow 8x = 19 \approx 2.4$? Or maybe $2x+1=5 \rightarrow 2x=4 \rightarrow x=2$. Wait, B is 4. Maybe $2x=8$?

Choice Bhoice A is incorrect because this results from calculation error.

Choice Bhoice D is incorrect because this results from adding.