Four words have been given, out of which three are alike in some manner and one is different. Select the odd one.

Let's analyze all the options:

(a) Mouth Organ: Played by blowing air

(b) Flute: Played by blowing air

(c) Violin: Played by bowing or plucking

(d) Saxophone: Played by blowing air

Violin is different as it is a string instrument, while the others are wind instruments.

Thus, the correct option is (c)