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

Correct option is A

Tiara, Head-band, and Hairpin are all accessories worn on the head or used for hair.
Bangle is worn on the wrist, making it different from the others.
Thus, Bangle is the odd one out.
The odd one out is (a) Bangle.