Choose the pair of words that best express a relationship similar to that expressed in the original pair Diffident Arrogant

Diffident and arrogant are opposites. Day and night are also opposites. Agony and pain are near synonyms not opposites. Fearful and timid are also similar. Energetic and lucky are unrelated in meaning. The relationship tested is antonymy therefore the only pair that mirrors the original contrast is day and night.