The enthalpy diagram to the right represents a set of thermochemical equations. Which set of equations could it represent?

A + B Right arrow. C Delta.H1 = - 500 kJ
C + D Right arrow. E + 2F Delta.H2 = 100 kJ
F + D Right arrow. B Delta.H3 = 200 kJ

A + B Right arrow. C Delta.H1 = 800 kJ
C + D Right arrow. E + 2F Delta.H2 = - 200 kJ
F + D Right arrow. B Delta.H3 = - 300 kJ

A + D Right arrow. E Delta.H1 = 500 kJ
D Right arrow. F Delta.H2 = - 300 kJ
An enthalpy diagram has 4 arrows; arrow lengths are not to scale. Arrow 1, delta H Subscript 1, points from the base line up to a top line. Arrow 2, delta H Subscript 2, points a short distance down from the top. Arrow 3, delta H Subscript 3, continues down, is a little longer than Arrow 2, and ends at a horizontal line halfway between the top and base lines labeled E + F. Arrow 4, Delta H Subscript r x n, points up from the base labeled A + 2 D to the center line.