Kasei Valles!

[gmat_perfect]

The features of the floor of the Kasei Valles on Mars look just like those at the base of Antarctic ice streams, so it suggests that possibly it was flowing ice that carved the giant Martian channels previously attributed to cataclysmic floods.

(A) so it suggests that possibly it was flowing ice that
(B) a suggestion that flowing ice may have
(C) to suggest flowing ice as possibly having
(D) suggesting that flowing ice may have
(E) which is suggestive of flowing ice having possibly

[spoiler]OA: D[/spoiler]

[ptandon]

The features of the floor of the Kasei Valles on Mars look just like those at the base of Antarctic ice streams, so it suggests that possibly it was flowing ice that carved the giant Martian channels previously attributed to cataclysmic floods.

(A) so it suggests that possibly it was flowing ice that
(B) a suggestion that flowing ice may have
(C) to suggest flowing ice as possibly having
(D) suggesting that flowing ice may have
(E) which is suggestive of flowing ice having possibly

[spoiler]OA: D[/spoiler]

D because the verb-ing modifier here modifies the preceeding clause showing the result of the action.

[indiantiger]

D, -ing form usage is correct.

Dude Gmat_perfect did not you post the same question earlier also?