Correct answer: (b) 2 and 3 only
Explanation
- A
1 and 2 only
1 and 2 only. Lethal CO is not the distinctive smelter scare as keyed; SO2 and slag metals are.
- B
2 and 3 only
2 and 3 only. Copper slag can leach metals; smelters emit SO2. Statement 1 over-claims carbon monoxide.
- C
1 and 3 only
1 and 3 only. Slag leaching is also true.
- D
1, 2 and 3
All three. Statement 1 is the miss.
Summary. Official key is (b) 2 and 3 only. Copper smelting is a sulphur-dioxide and slag/heavy-metal story. Lethal carbon monoxide is not the keyed plant risk here.
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