To determine which word has a different stress pattern from the others, we need to identify the primary stress in each word. Here are the answers for each question:

**Question 11:**
- A. contestant (con-TEST-ant)
- B. picturesque (pic-tur-ESQUE)
- C. committee (com-MIT-tee)
- D. astounding (a-STOUND-ing)

**Answer:** B. picturesque (The stress is on the last syllable, while the others have stress on the second syllable.)

**Question 12:**
- A. imperial (im-PER-i-al)
- B. spectacular (spec-TAC-u-lar)
- C. historical (his-TOR-i-cal)
- D. recognition (rec-og-NI-tion)

**Answer:** D. recognition (The stress is on the third syllable, while the others have stress on the second syllable.)

**Question 13:**
- A. valuable (VAL-u-a-ble)
- B. memorable (MEM-o-ra-ble)
- C. historical (his-TOR-i-cal)
- D. fascinating (FAS-ci-na-ting)

**Answer:** C. historical (The stress is on the second syllable, while the others have stress on the first syllable.)

**Question 14:**
- A. geological (ge-o-LOG-i-cal)
- B. archaeology (ar-chae-OL-o-gy)
- C. administrative (ad-MIN-is-tra-tive)
- D. ecological (e-co-LOG-i-cal)

**Answer:** C. administrative (The stress is on the second syllable, while the others have stress on the third syllable.)