For Which Reaction Below Does the Enthalpy Change Under Standard $\rightarrow$

For which reaction below does the enthalpy change under standard conditions correspond to a standard enthalpy of formation?

A) 2H₂(g) + C(s) $\rightarrow$ CH₄(g)
B) CO₂(g) + C(s) $\rightarrow$ 2CO(g)
C) 2NO₂(g) $\rightarrow$ N₂O₄(g)
D) CO(g) + H₂O(g) $\rightarrow$ CO₂(g) + H₂(g)
E) CO₂(g) + H₂(g) $\rightarrow$ CO(g) + H₂O(g)