NAIVE

The word “naive” typically means showing a lack of experience, wisdom, or judgment. Therefore, the words that are opposite in meaning to “naive” would be:

a) Crafty: Clever at achieving one’s aims by indirect or deceitful methods. b) Diplomatic: Having the ability to deal with people in a sensitive and effective way. d) Wily: Skilled at gaining an advantage, especially deceitfully.

The word that does not fit in this context is:

c) Brave: Ready to face and endure danger or pain; showing courage.

Therefore, “brave” is the most appropriate choice here as it is not the correct antonym for “naive”.