Which of the following reactions is called the Wurtz-Fittig reaction?
- A$C_6H_5X + R-X + 2Na \xrightarrow{\text{dry ether}} C_6H_5-R + 2NaX$
- B$2C_6H_5X + 2Na \xrightarrow{\text{dry ether}} C_6H_5-C_6H_5 + 2NaX$
- C$2R-X + 2Na \xrightarrow{\text{dry ether}} R-R + 2NaX$
- D$C_6H_5X + C_6H_5X + 2Na \xrightarrow{\text{dry ether}} C_6H_5-C_6H_5 + 2NaX$
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