THE CORRECT ANSWER IS D. THE SUBJECT OF THE ORIGINAL SENTENCE IS &#...
2. The correct answer is D.
The subject of the original sentence is "the mountain cornfloss,"
which is singular. However, the main verb is "grow," which is
plural. We need to replace "grow" with "grows". Moreover, "thought
of as being" is wordy and awkward. We need to find a more elegant
way to phrase this.
Choice D corrects the subject-verb issue and also finds a more
economical phrasing in "and thought to be".