'Prefix' (उपसर्ग) 'un-' जोड़ने पर 'happy' बनता है:

उत्तर: (B) Unhappy — Prefix changes meaning: un+happy = unhappy (negative). Common prefixes: un- (not), re- (again), pre- (before), mis- (wrong), dis- (not), over- (excess). Suffix changes word class: happy→happiness (adj...