Sentence Correction

Old question. It's been discussed here a few times. My question is if my source is wrong. This is the exact passage from the book (I've checked it for mistake. No errors). I picked D but the answer is E. Because E, as is doesn't seem to make sense to me.

I searched the forum and other people posted the same passage except their choice E has "such as" not just "such." Can someone who also has seen this question from a non-internet source confirm? If this passage is correct why E? (My source is an actual book from GMAC, hence the confusion).


19. Teratomas are unusual forms of cancer because they are composed of tissues such as tooth and bone not normally found in the organ in which the tumor appears.


(A) because they are composed of tissues such as tooth and bone
(A) crests and troughs that remain stationary although the air that forms them is moving rapidly, are
(B) because they are composed of tissues like tooth and bone that are
(B) crests and troughs that remain stationary although they are formed by rapidly moving air, are
(C) because they are composed of tissues, like tooth and bone, tissues
(C) crests and troughs that remain stationary although the air that forms them is moving rapidly, is
(D) in that their composition, tissues such as tooth and bone, is
(D) stationary crests and troughs although the air that forms them is moving rapidly, are
(E) in that they are composed of tissues such tooth and bone, tissues