The reaction equation for copper(II) oxide, CuO, and ammonia is shown below. $3\mathrm{CuO} + 2\mathrm{NH_3} \rightarrow 3\mathrm{Cu} + 3\mathrm{H_2O} + \mathrm{N_2}$ $[M_r:\ \mathrm{CuO},\ 80;\ \mathrm{NH_3},\ 17;\ \mathrm{H_2O},\ 18;\ \mathrm{N_2},\ 28]$ $[A_r:\ \mathrm{Cu},\ 64]$ Which of the following statements about this reaction are correct?
- A1, 2 and 3
- B1 and 2 only
- C1 and 3 only
- D2 and 3 only