Questão de Língua Inglesa

According to the text, analyze the following items: I. The expression “which”, in “… agency, which said its st warning…” (1 paragraph), refers to “agency”. II. The word “single”, in “…single, short exposure to the rd drugs…” (3 paragraph), has a similar meaning to “alone”. III. The word “but”, in “… But, all the studies in children…” rd (3 paragraph), could be substituted, without any change in meaning, by “also”. The CORRECT item(s) is(are):