Step 1: Vitriolage means vitriol throwing, that is, throwing of a corrosive substance over another person with intent to disfigure or injure.
Step 2: Although vitriol historically refers to sulphuric acid, in vitriolage the corrosive need not be H2SO4; any corrosive acid or alkali thrown on a person qualifies.
Step 3: The eyes and face are the most commonly and severely affected organs, often producing permanent scarring and blindness.
Step 4: The other options describe specific intents (suicide, murder) or a pathological lesion, none of which defines the term itself, so vitriol throwing is correct.