单项选择题

A.2RNH2+H2S→(RNH32S、(RNH32S+H2S→2RNH3HS
B.2R3N+H2S→(R3NH)2S、(R3NH)2S+H2S→2R3NHHS
C.2R2NH+H2S→(R2NH)2S、(R2NH)2S+H2S→2R2NH2HS
D.2R3N+H2O+CO2→(R3NH)2CO3、(R3NH)2CO3+H2O+CO2→2R3NHHCO3