Country Alpha takes 4 hours to produce a unit of jet fuel and 2 hours to produce a unit of butter. Country Omega takes 9 hours to produce a unit of jet fuel and 3 hours to produce a unit of butter. Based on this, what range of jet fuel for every 60 units of butter would be mutually beneficial?

A. Between 0.33 and 0.5 units of jet fuel

B. Between 2 and 3 units of jet fuel

C. Between 4 and 9 units of jet fuel

D. Between 20 and 30 units of jet fuel

E. Between 120 and 180 units of jet fuel