Which of the following will be most stable diazonium salt $RN_2^+X^-$?

Question

( A ) $C_6H_5CH_2N_2^+X^-$
( B ) $CH_3N_2^+X^-$
( C ) $C_6H_5N_2^+X^-$
( D ) $CH_3CH_2N_2^+X^-$