For which of the following reactions does the heat of reaction represent the bond energy of $HCl$?
- A$HCl_{(g)} \rightarrow H^{+}_{(g)} + Cl^{-}_{(g)}$
- B$HCl_{(g)} \rightarrow \frac{1}{2}H_{2(g)} + \frac{1}{2}Cl_{2(g)}$
- C$2HCl_{(g)} \rightarrow H_{2(g)} + Cl_{2(g)}$
- D$HCl_{(g)} \rightarrow H_{(g)} + Cl_{(g)}$
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