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.