To spell "Recommendation'' correctly:
- Remember it has double 'm' in the middle.
- Break it down as "Re-com-men-da-tion.''
- Watch out for repeated consonants in English words.
Check each word: Step 1: Option A - Perseverance
Correctly spelled. Means persistence in doing something despite difficulty. Step 2: Option B - Labyrinth
Correctly spelled. Means a complicated maze or network of paths. Step 3: Option C - Diligent
Correctly spelled. Means showing care and effort in work or duties. Step 4: Option D - Recomendation
Correct spelling is "Recommendation'' with double 'm'.
Option D is missing one 'm' and is thus incorrect.
Hence, Option D is misspelled.