Given the Following Data

Given the following data:
2 Cr (s) + ³/₂ O₂ (g) →Cr₂O₃ (s) D G ° = - 100 kJ 2 CrO (s) + O₂ (g) →CrO₃ (s) D G ° = - 50 kJ 2 CrO (s) + ¹/₂ O₂ (g) →Cr₂O₃ (s) D G ° = - 250 kJ Calculate D G ° for:
Cr (s) + ³/₂ O₂ (g) →CrO₃ (s)

A) 50 kJ
B) 25 kJ
C) - 100 kJ
D) - 300 kJ
E) - 400 kJ