Sure! Here are the answers to the questions based on pronunciation and stress:

**Question 1:**
A. issue B. litter C. device D. impact
- **Answer:** B. litter (the 'i' in litter is pronounced /ɪ/, while the other three have a different vowel sound)

**Question 2:**
A. product B. organic C. collect D. recycle
- **Answer:** B. organic (the 'or' is pronounced /ɔːr/ while the other words have different vowel sounds)

**Question 3:**
A. rubbish B. impact (n) C. global D. pollute
- **Answer:** D. pollute (primary stress is on the second syllable, while the others have stress on the first syllable)

**Question 4:**
A. sustainable B. calculate C. estimate D. atmosphere
- **Answer:** D. atmosphere (the stress is on the first syllable in the others, while 'atmosphere' has stress shifted)

I hope this helps! Let me know if you have any more questions.