The greatest road system built in the americas prior to the arrival of christopher columbus was the incan highway, which, over 2,500 miles long and extending from northern ecuador through peru to southern chile. a. columbus was the incan highway, which, over 2,500 miles long and extending b. columbus was the incan highway, over 2,500 miles in length, and extended c. columbus, the incan highway, which was over 2,500 miles in length and extended d. columbus, the incan highway, being over 2,500 miles in length, was extended e. columbus, the incan highway was over 2,500 miles long, extending

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.

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.

dr. kings dream speech

explanation:

it was late in the day and hot, and after a long march and an afternoon of speeches about federal legislation, unemployment and racial and social justice, the rev. dr. martin luther king jr. finally stepped to the lectern, in front of the lincoln memorial, to address the crowd of 250,000 gathered on the national mall.