Correct Answer & Explanation
Option C
• 'Discompose' means to disturb the composure of, agitate, or abash (অপ্রস্তুত বা লজ্জিত করা).
• 'Embarrass' directly matches this meaning.
• 'Touchstone' means standard/criterion, 'appendage' means adjunct, and 'preservation' means accumulation/storage.