According to me, there is a split up in the answer choices mainly between "As" versus "Like".
Source:Manhattan SCLike is used to compare nouns, pronouns, or noun phrases. Never put a clause or a prepositional phrase after like!
Example : LIKE her brother, Ava aced the test.
Here, like is followed by the noun phrase her brother. The whole phrase Like her brother indicates a comparison between Ava and her brother (two nouns).
On the other hand, AS can be used to compare two CLAUSES:
Wrong: LIKE her brother DID, Ava aced the test.
Right: AS her brother DID, Ava aced the test.
The words her brother did form a clause (did is a working verb). Therefore, use as to make the comparison between the two clauses Ava aced the test and her brother did, too.
Here we have to compare volcanoes which are nouns, so will use LIKE.
Mount St. Helens consists of a large eruptive cone containing lava rock interlayered with ash, pumice, and other deposits,
is part of the Pacific Ring of Fire, the ring of volcanoes and associated mountains around the Pacific Ocean..
The bold part above is not underlined. The verb "is" refers to Mount Helens. So, consists would be part of a modifier which is in D.
E is wrong as "contain" is plural verb but Mount Helens is singular.
So, D is the right answer