The correct option is A CH3NH2
CH3NH2 as a nucleophile: CH3NH2⟶CH⊕3+NH⊝2
CH3NH2 as an electrophile: CH3NH2⟶CH3NH⊝+H⊕
The NH⊝2 acts as a nucleophile and H+ acts as an electrophile.
In other compounds, Cl−,CN− and OH− acts as a nucleophile only and no elctrophile is present.