In the form of dichromate, Cr(VI) is a strong oxidising agent in acidic medium but Mo(VI) in `Mo0_(3)` and W(VI) in `W0_(3)` are not because
A. `Cr(VI)` is more stable than `Mo(VI)` and `W(VI)`
B. `MO(VI)` and `W(VI)` are more stable than `Cr(VI)`
C. Higher oxidation states of heavier members of group 6 of transition series are more stable
D. Lower oxidation states of hevier members of group 6 transition series are more stable
