Ammonium nitrate decomposes to nitrogen, oxygen and water. Which balanced equation is correct?

1. One NH4NO3 unit holds 2 N, 4 H and 3 O atoms. 2. Take 2 NH4NO3, giving 4 N, 8 H and 6 O atoms on the left. 3. The 8 H atoms need 4 H2O, and the 4 N atoms need 2 N2. 4. Those 4 H2O molecules use 4 of the 6 O atoms, leaving 2 O atoms, which form 1 O2. 5. So 2NH4NO3 gives 2N2 + O2 + 4H2O, with oxygen balanced last because it appears twice on the right. 6. Option D fails because 2 O2 plus 4 H2O would demand 8 O atoms, but only 6 are supplied. _Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.1 Writing and Balancing Chemical Equations_