Correct Answer - C
Element Ti exhibits a variety of oxidation states `(-1, 0, +2, +3` and `+4)` but the most common and most stable oxidation states is `+4`. The oxidation state`+3` is reducing and `Ti^(3+)` ions are more strongly reducing than `Sn^(2+)`. The `+2` stateis veryunstable and is so strongly reducing that it reduces water. The lower oxidation states `(0, -1` and `-2)` which are found in dipyridyl complexes tend to disproportionate.
