Choose the word whose underlined part is pronounced differently from the other’s

I. Choose the word whose underlined part is pronounced differently from the other’s.
3. A. mo̲u̲ntain B. co̲u̲ntry C. gro̲u̲nd D. clo̲u̲dy
4. A. to̲morrow B. o̲pposite C. sho̲pping D. po̲pcorn
5. A. months̲ B. laptops̲ C. pictures̲ D. elephants̲