有化学反应：4C3H5N3O9 + 5O2 ===12A + 12CO2 + 10H2O，则A的化学式为 请选择DCBA6Y(H4H(V*u-}2V/e+Z,I*A2K6i(I'g(I2S
A．NO2V/e+Z,I*A2K6i(I'g(I2S
B．NO22V/e+Z,I*A2K6i(I'g(I2S
C．N22V/e+Z,I*A2K6i(I'g(I2S
D．N2O2V/e+Z,I*A2K6i(I'g(I2S