Let's analyze the words in each question based on the position of primary stress.

### Question 1:
**Words:**
A. dependent
B. monument
C. assignment
D. performance

**Stress Analysis:**
- **dependent**: stress is on the second syllable (de-PEN-dent).
- **monument**: stress is on the first syllable (MON-u-ment).
- **assignment**: stress is on the second syllable (as-SIGN-ment).
- **performance**: stress is on the second syllable (per-FORM-ance).

**Differing Word:**
**B. monument** is the correct answer because it has the primary stress on the first syllable, while the others have it on the second syllable.

### Question 2:
**Words:**
A. amenity
B. experience
C. embarrassing
D. optimistic

**Stress Analysis:**
- **amenity**: stress is on the second syllable (a-MEN-i-ty).
- **experience**: stress is on the second syllable (ex-PER-i-ence).
- **embarrassing**: stress is on the second syllable (em-BAR-rass-ing).
- **optimistic**: stress is on the third syllable (op-ti-MIS-tic).

**Differing Word:**
**D. optimistic** is the correct answer because it has the primary stress on the third syllable, while the others have it on the second syllable.

### Final Answers:
1. **B. monument**
2. **D. optimistic**