Which of the Following Reactions Corresponds to the Thermochemical Equation

Multiple Choice

Which of the following reactions corresponds to the thermochemical equation for the standard enthalpy of formation of N,N-diethyl-m-toluamide,C₁₂H₁₇NO(l) ,the active ingredient in some insect repellents?

A) 12C(l) + 17H(l) + N(l) + O(l) → C₁₂H₁₇NO(l)
B) 12C(g) + 17H(g) + N(g) + O(g) → C₁₂H₁₇NO(g)
C) 12C(s) + 17H(g) + N(g) + O(g) → C₁₂H₁₇NO(l)
D) 12C(s) + H₂(g) + N₂(g) + O₂(g) → C₁₂H₁₇NO(l)
E) 12C(g) + 17H(g) + N(g) + O(g) → C₁₂H₁₇NO(l)