Correct Answer - Option 1 : Blue
Arranging the given words as per they appear in the English dictionary :
The correct order of the words is:
2) Bird
4) Black
3) Blind
1) Blue
The fourth word is Blue.
Hence, the correct answer is "Blue".
1. First of all, check the common letter in all.
2. Arrange them according to the alphabet they come first.
3. When common letters are arranged, then go for the rest and that will come last.