D is the correct answer because you are using a connective :)
Answer:
The best clue that the organizational structure of this essay is order of importance, the fact that the passage begins with the transitional phrase "first of all."
Explanation:
Order of Importance is a quite common type of organization structure which is used by many writers while writing essays, and other informational works. However, it is most importantly used for writing argumentative essays.
From the essay mentioned, we can easily figure out that this essay is about arguing whether something is impossible. The very first line of the essay begins with, ‘First of all’ which is transitional phrase and which depicts the possibility of arguing in itself.
Answer: I would contend that the right answer is the E) "Columbus, the Incan highway was over 2,500 miles long, extending..."
Explanation: Just to elaborate a little on the answer, it can be added that it is not very formal to use the word "being," so option D should be easily discarded. In addition, in option C the use of "which" seems redundant, since the sentence is already about the Incan highway. Furthermore, option B is also incorrect, since the sentence should say "extending" and not "extended" (it extended that distance, but it was not extended). Finally, option A can also be discarded, since "which" should have been followed by a verb. Option E is, therefore, the correct one, since the first sentence acts as a definition of the Incan highway, which is subsequently described in further detail.
