Here are the words where the underlined parts are pronounced differently from the others:

1. **A. dolls** (pronounced /dɒlz/)
2. **B. watches** (pronounced /wɒtʃɪz/)
3. **C. units** (pronounced /juːnɪts/)
4. **C. points** (pronounced /pɔɪnts/)
5. **A. schools** (pronounced /skuːlz/)

**Answers:**
1. A. dolls
2. B. watches
3. C. units
4. C. points
5. A. schools

All answers contain underlined parts that are pronounced differently from the others in their respective groups.