1. Smoulder 2. Smother 3. Smuggle 4. Smudge

First two letters of all the words are same so verifying the third letter.

The third letter of Smoulder and Smother is 'o' which is before 'u' in alphabetical order. So Smoulder and Smother placed before Smuggle and Smudge.

Among Smoulder and Smother, the fourth letter of Smother is before Smoulder in alphabetical order. So Smother is placed first and Smoulder is placed second.

Among Smuggle and Smudge, the fourth letter of Smudge is before Smuggle in alphabetical order. So Smudge is placed third and Smuggle is placed fourth.

∴ The order of the givens words according to English dictionary is Smother, Smoulder, Smudge, Smuggle

Hence, the correct answer is Option C