Match the compounds to the CORRECT oxidation states of the underlined metal
 

	COMPOUND		OXIDATION STATE
I	$K\underset{\_}{Mn}{O}_4$	A	+1
II	$K_2\underset{\_}{Cr}{O}_4$	B	7
III	$\underset{\_}{C{u}_2}{I}_2$	C	$-\frac{1}{2}$
IV	$K\underset{\_}{O_2}$	D	+6

	I	II	III	IV
1	B	D	A	C
2	D	A	C	B
3	A	C	B	D
4	B	C	D	A