How can fluorobenzene be prepared in the laboratory?

• A
  By heating petrol with $HF$ and $KF$
• B
  By heating the diazonium salt obtained from the diazotization of aniline with $HBF_4$
• C
  By direct fluorination of benzene with $F_2$ gas
• D
  By reacting bromobenzene with $NaF$ solution