Correct answer: (a) 1, 2 and 3 only
Explanation
- A
1, 2 and 3 only
1, 2 and 3 only. Copper slag, cold-mix asphalt and geotextiles cut the rural-road carbon load. Hot-mix and ordinary Portland cement are the energy-heavy pair.
- B
2, 3 and 4 only
2, 3 and 4 only. Hot mix is not the green preference.
- C
4 and 5 only
4 and 5 only. The carbon-heavy pair.
- D
1 and 5 only
1 and 5 only. Cement is the miss.
Summary. Official key is (a) 1, 2 and 3 only. Preferred lower-footprint rural-road kit: copper-slag aggregate, cold-mix asphalt, geotextiles. Hot-mix plants and Portland cement are the higher-carbon options in the list.
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