Platinum is very resistant to corrosion and does not tarnish. However, while it is (i)____________ material to use for rings, its extremely high melting point and the fact that it is less (ii)____________ than gold makes it (iii)____________. A. an ideal B. rigid C. a good source for personal ornaments D. a supplementary E. malleable F. a superb alternative for G. a unfavorable H. costly I. a difficult material to work with