Assertion : The correct order of oxidising power is : VO2+ < Cr2O72- < MnO4-
Reason : The oxidation state of Mn is +7.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not correct explanation of A
(c) A is true but R is false
(d) A and R are false