The underlined portion of the sentence is described first by the term The parto of the sentence that is appositive is in between commas.The second term is clause.The part that is underlined is called a because it gives additional information about the main clause.
After reading the passage above, one can infer that it belongs to an article or an essay which purpose is to inform the reader about the population boom and its consequences (cause-effect writing). The writer developed the main event in the introduction of the passage and then added supporting sentences about the consequences of that main event. The population is growing in cities such as San Antonio, Phoenix, and Los Angeles and this event has serious effects on the desert environment of these cities mentioned earlier, being the most obvious one the water shortages. The reader can infer all this information thanks to the organization of the text and the words or connectors used. The organization that has been used by the writer is The Casual Chain (one effect is a cause of another effect, which in turn can become a cause of another effect, and so on) and some of the words/connectors chosen to describe the relationship of the events are “result”, “Because…,”, and “concern”.
(for person above)^ that's rude! You don't know what they're going through, this might be the only question they ever asked about, they might be an A+ student who does the readings, goes to classes, has no overdues, etc. BE MORE NICE/KIND TO PEOPLE! Anyways, I would say the answer is c - to emphasize his claim that slavery should have no place in the land of the free. :) Hope this helps, have a great day/weekend EVERYONE! <span> </span>
................................................................................................................................................................................................oh and the answer is a:)