Pick out the antonym of the word ‘dissimulateʼ.

The word 'dissimulate' means to conceal or put in disguise; the opposite of this would be to reveal and open. The correct antonym among the given options is in option D, 'reveal'. Option C has two errors: the first is the form of the word (which should have been conceal rather than concealed), and the second is that it is a synonym instead of being an antonym. Options A and B are irrelevant in this context. The correct answer is option D.