The correct answer is **-cal** (Option 2). **Comprehensive Derivation:** The correct answer is '-cal'. Explanation & Key Takeaways: • In the sentence we are talking about something said by someone and it is being addressed as his imagination and not considered real. • We need a word that defines the situation therefore, here we are looking for a noun. • Now, let's look at the options. • Option 1 - 'hypotheticity' doesn't express any meaning of its own. It doesn't exist in the standard English dictionary. • Option 2 - 'hypothetical' means possible situation loosely based on a tentative conjecture explaining an observation. This word completes the sentence in meaning. • Option 3 - 'hypothetiment' doesn't express any meaning of its own. It doesn't exist in the standard English dictionary. • Option 4 - 'hypothetien' doesn't express any meaning of its own. It doesn't exist in the standard English dictionary. Hence, the option 2 is the correct answer. The correct sentence is - 'What he says is in the realm of imagination. It is highly hypothetical'. **Option Elimination:** • **Option 1 (-city)**: Incorrect distractor. • **Option 2 (-cal)**: Correct Answer; accurate according to canonical reference. • **Option 3 (-ment)**: Incorrect distractor. • **Option 4 (-en)**: 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: -cal corresponds to Option (2).