Which of the following statements are true?
i) Elements which are least reactive occur in free state or native state
ii) Earthly or undesired materials present along with ore are called gangue
iii) Among metals, aluminium is the most abundant in the earth crust
iv) All ores are minerals but all minerals are not ores
v) Gemstone "Ruby" is the impure form of `Al_2O_3` containing impurity : Co
vi) The set of d-block elements Cu, Ag, Au mostly occur as sulphide ore

Options

A. All are true
B. All except V are true
C. All except (v) and (vi) are true
D. All except VI are true