Correct answer: (c) 1, 3, 4, 6 and 7 only
Explanation
- A
1, 2, 4 and 5 only
1, 2, 4 and 5 only. Tsunamis and planet-wide forest fires are not solar-flare effects.
- B
2, 3, 5, 6 and 7 only
2, 3, 5, 6 and 7 only. Keeps tsunami and fires; drops GPS.
- C
1, 3, 4, 6 and 7 only
1, 3, 4, 6 and 7 only. GPS/nav, grids, auroras, satellite orbits, polar HF radio. Not tsunamis, not global forest fire.
- D
1, 2, 3, 4, 5, 6 and 7
All seven. 2 and 5 are the misses.
Summary. Official key is (c) 1, 3, 4, 6 and 7 only. A severe solar storm can blind GNSS, stress power grids, light auroras far from the poles, drag satellites, and black out polar HF radio. It does not launch equatorial tsunamis or set the planet’s forests on fire.
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