The correct answer is C.

Explanation: The stress patterns for the words are as follows:

- A. generous: Stress is on the first syllable (GEN-er-ous).
- B. legalize: Stress is on the second syllable (le-GA-lize).
- D. hazardous: Stress is on the first syllable (HAZ-ard-ous).

C. factious: Stress is on the first syllable (FAC-tious), but the stress pattern is different from the others, as it is the only one with primary stress on the first syllable and the secondary stress on the second syllable.

Thus, factious has a different stress pattern compared to the others.