19. To which one of the following reactions occurring at 25°C does the symbol △H°f[H2SO4(l)] refer?
(A) 2H(g) + S(g) + 4O(g) → H2SO4(l)
(B) H2(g) + S(g) + 2O2(g) → H2SO4(l)
(C) H2SO4(l) → H2(g) + S(s) + 2O2(g)
(D) H2(g) + S(s) + 2O2(g) → H2SO4(l)

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