Indicate the word that differs from the other three in the position of primary stress: difficulty, simplicity, discovery, commodity

* Hướng dẫn giải

- Difficulty /ˈdɪfɪkəlti/ (n): sự khó khăn

- Simplicity /sɪmˈplɪsəti/ (n): tính đơn giản

- Discovery /dɪˈskʌvəri/ (n): sự khám phá

- Commodity /kəˈmɒdəti/ (n): hàng hóa