Correct answer: (c) All three
Explanation
- A
Only one
Only one. All three are discussed carbon-removal routes.
- B
Only two
Only two. Enhanced rock weathering, ocean alkalinity and subsurface carbonated storage are all on the list.
- C
All three
All three. Basalt on fields, lime in oceans, and pumping carbonated water into old mines / formations.
- D
None
None. Each is a named CDR / CCS idea.
Summary. Official key is (c) all three. Spreading crushed basalt (enhanced weathering), adding alkalinity to the ocean, and injecting dissolved CO₂ into subsurface voids are all discussed carbon capture and sequestration pathways.
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