Correct Answer - B
Manganese shows maximum number of oxidation states because it has 5 unpiared electrons in 3d and also contains 2 electrons in 4s sub-shell.
`+2+3+4+5+6+7`
Other given metals show the following oxidation states
`Cr=+2+3+4+5+6`
`Fe=+2+3`
Ti `=+2+3+4`
