In ABC, D is the midpoint of **. E is a point on AC such that AE : EC = 2 : 1 and F is a point on AB such that AF : FB = 3 : 1. Line segments AD and FE intersect at point O. What is the ratio of the area of DOF to the area of DOE?

1.8:9
2.9:8
3.3:4
4.4:3