Give the possible structure of X in the following reaction: C₆H₆ + D₂SO₄ [D₂O] X 
| List-I | List-II | ||
| A. | ![]() | I. | Br2 in CS2 |
| B. | ![]() | II. | Na2CR2O7/H2SO4 |
| C. | ![]() | III. | Zn |
| D. | ![]() | IV. | CHCl3/NaOH |

The stable carbocation formed in the above reaction is
In which case the \( \text{NO}_2 \) will attack at the meta position? 