The correct answer is C.

Explanation: The vowel sound represented by the underlined letter "y" in "tyranny" is the short vowel sound /ɪ/ (as in "myth").

- C. myth: The vowel sound in "myth" is /ɪ/, which matches the vowel sound in "tyranny."

Other options:
- A. high: The vowel sound is /aɪ/, which is different from the /ɪ/ sound.
- B. dye: The vowel sound is /aɪ/, which is different from the /ɪ/ sound.
- D. myopia: The vowel sound is /aɪ/, which is different from the /ɪ/ sound.

Thus, "myth" is the word that has the same vowel sound as the one in "tyranny."