Answer:
While it is difficult to determine exactly how many Natives lived in North America before Columbus, estimates range from a low of 2.1 million to 7 million people to a high of 18 million.
The difficult decision was: Who to eat first.
True, you want them to understand you as easily as possible and they will not know slang, etc. if they speak little english
The sentence that has faulty parallel structure is option A
The trip started in Colorado, went through New Mexico, and the the end being California.
Faulty parallelism is a construction in which two or more parts of a sentence are equivalent in meaning but not grammatically similar in form. It does not follow the same grammatical pattern according verb tenses. The correct version would be and ended in Carlifornia
