Sentence Correction

985. Those who have visited the Grand Canyon have typically seen layers of sediment in the gaping canyon, with different colors that mark the passage of time like the rings in a tree trunk.
(A) seen layers of sediment in the gaping canyon, with different colors that mark
(B) see layers of sediment in the gaping canyon, whose different colors mark
(C) been seeing layers of sediment in the gaping canyon, whose different colors are markers of
(D) been able to see layers of sediment in the gaping canyon, with different colors marking
(E) seen layers of sediment in the gaping canyon, marking by different colors
OA is D Why not A? Please explain

First I selected A but after looking at OA, I was surprised and found thread

https://www.beatthegmat.com/doubt-about- ... t1018.html

The OA D is wrong. Ans is A.

Thanks man!!