The correct answer is **-sive** (Option 2). **Comprehensive Derivation:** The correct answer is '-sive'. Explanation & Key Takeaways: • In the sentence a disorder is being mentioned. • Let's add the suffixes given in the option and find which one of it is related to a disorder. • Option 1 'Compulion' is the word formed by adding the suffix in the option. This word doesn't have a meaning of its own and doesn't exist in the standard English dictionary. • Option 2 'Compulsive' is the word formed. It is a noun and it means one who exhibits compulsive behaviours. Compulsive disorder features a pattern of unwanted thoughts and fears. • Option 3 'Compulorily' is the word formed and it doesn't have a meaning of its own and doesn't exist in the standard English dictionary. • Option 4 'Compulsively' is an adverb and it means obsessively. • Hence, option 2 is the correct answer. Therefore, the correct sentence is -'Excessive to detail may be treated as a compulsive disorder'. **Option Elimination:** • **Option 1 (-ion)**: Incorrect distractor. • **Option 2 (-sive)**: Correct Answer; accurate according to canonical reference. • **Option 3 (-orily)**: Incorrect distractor. • **Option 4 (-sively)**: Incorrect distractor. **Exam Trap:** Be careful of misleading distractors and subtle terminology differences. Verify core properties before selecting your answer. **Memory Booster:** Core mnemonic rule: -sive corresponds to Option (2).