Which of the following will be most stable diazonium salt  $R{ \mathrm{N}}_2^{+}{X}^{-}?$

 

• A

  ${\mathrm{CH}}_3{ \mathrm{N}}_2^{+}{X}^{-}$

• B

  ${\mathrm{C}}_6{\mathrm{H}}_5{ \mathrm{N}}_2^{+}{X}^{-}$

• C

  ${\mathrm{CH}}_3{\mathrm{CH}}_2{ \mathrm{N}}_2^{+}{\mathrm{X}}^{-}$

• D

  ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2{ \mathrm{N}}_2^{+}{\mathrm{X}}^{-}$