The formation of water from $H_{2(g)}$ and $O_{2(g)}$ is an exothermic reaction because

• A
  The chemical energy of $H_{2(g)}$ and $O_{2(g)}$ is more than that of water
• B
  The chemical energy of $H_{2(g)}$ and $O_{2(g)}$ is less than that of water
• C
  Not dependent on energy
• D
  The temperature of $H_{2(g)}$ and $O_{2(g)}$ is more than that of water