The Reaction That Represents the Standard Enthalpy of Formation for Acetone

The reaction that represents the standard enthalpy of formation for acetone (CH₃COCH₃) , a common ingredient in nail polish remover is:

A) 3 C(graphite) + 3 H₂(g) + ½ O₂(g) $\rarr$ CH₃COCH₃(l)
B) 6 C(diamond) + 6 H₂(g) + O₂(g) $\rarr$ 2 CH₃COCH₃(l)
C) 3 C(diamond) + 3 H₂(g) + ½ O₂(g) $\rarr$ CH₃COCH₃(l)
D) CH₃COCH₃(l) $\rarr$ 3 C(graphite) + 3 H₂(g) + ½ O₂(g)
E) CH₃COCH₃(l) + 4 O₂(g) $\rarr$ 3 CO₂(g) + 3 H₂O(g)