To Which One of the Following Reactions, Occurring at 25^oC

Multiple Choice

To which one of the following reactions, occurring at 25^oC, does the symbol ΔH^o_f [H₂SO₄(l) ] refer?

A) H₂(g) + S(s) + 2 O₂(g) <-----> H₂SO₄(l)
B) H₂SO₄(l) <-----> H₂(g) + S(s) + 2 O₂(g)
C) H₂(g) + S(g) + 2 O₂(g) <-----> H₂SO₄(l)
D) H₂SO₄(l) <-----> 2 H(g) + S(s) + 4 O(g)
E) 2 H(g) + S(g) + 4 O(g) <-----> H₂SO₄(l)