To identify the word with a different stress pattern, let's analyze the options provided in section I:

1. **A. insist** (stress on the second syllable: in-SIST)
2. **B. require** (stress on the second syllable: re-QUIRE)
3. **C. assist** (stress on the second syllable: as-SIST)
4. **D. glacier** (stress on the first syllable: GLA-cier)

The word that has a different stress pattern is **D. glacier**, as it is the only word with the stress on the first syllable while the others have stress on the second syllable.