Q201360 - FUNDATEC Analista de Projetos - Econômico-Financeira 2017

If we add the prefix '-UN’ to
some words in English, we can get the opposite
of that word, like in ‘unwanted’ (l. 29). In this
sense, consider the following words and analyze
them:

I. able.
II. happy.
III. fair.
IV. acceptable.


Which of them can be an opposite just by adding
the prefix ‘-UN’?