The correct option is D TiO>VO>CrO>FeO
All of these monoxides belong to the same period. As we go from the left to the right, the electropositive character decreases. The effective nuclear charge also increases from the left to the right. Thus, the electropositivity is lowered as we move from the left to right across the periodic table. The appropriate order of basicity will be: TiO>VO>CrO>FeO