The correct answer is option 2: 711 and 95.

Here's why:

1. Original equation: 83 + 711 95 ÷ 9 × 2 = 20
2. Interchanging 711 and 95: 83 + 95 - 711 ÷ 9 × 2 = 20
3. Simplifying: 83 + 95 - 79 × 2 = 20
4. Further simplifying: 83 + 95 - 158 = 20
5. Final result: 20 = 20

Therefore, interchanging 711 and 95 makes the equation correct.