Sentence Correction

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

Source: 1000 SC

I not sure of the OA as some forum says D and others says A

Experts I need you help to understand the intended meaning and errors in the other individual options.

This SC can be found in Kaplan GMAT 800.
The OA is not D but A:

The OE's reason for eliminating D is inadequate.
On the GMAT, an answer choice will never be incorrect simply because it is wordy.
An incorrect answer choice on the GMAT will always contain at least one clear error of grammar or meaning.
I would ignore this SC.