Sentence Correction

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
[spoiler]
oa is C
What is wrong with A?[/spoiler]

I think it's going for meaning here. In A sighted on the sun seams like you were on the sun and you sighted them. Obviously no one was on the sun sighting anything... In B we have sighted at

(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

"appear" sounds better then "are visible", so we can eliminate A & B.
D sounds awkward.

I was down to C and E. And i chose E

OA=A

https://www.manhattangmat.com/forums/100 ... t1545.html

https://www.beatthegmat.com/note-of-caut ... t2775.html