GMAT Sentence Correction
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Source: OG
Level: 4
Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun's poles or equator.
- A are visible as dark spots on the surface of the Sun but have never been sighted on
- B are visible as dark spots that never have been sighted on the surface of the Sun
- C appear on the surface of the Sun as dark spots although never sighted at
- D appear as dark spots on the surface of the Sun, although never having been sighted at
- E appear as dark spots on the Sun's surface, which have never been sighted on