Three of the following four word-pairs are alike in a certain way and one is different. Pick the odd word-pair out.

A) Live : Die → Opposites (life vs. death) Correct

B) Motion : Rest → Opposites (movement vs. stillness) Correct​

C) Fly : Swim → Not exact opposites; both are modes of movement in different mediums (Odd one out)

D) Show : Hide → Opposites (revealing vs. concealing) Correct​

(because it represents different actions, not opposites).

Thus, the correct Odd one out option is (c) Fly : Swim.