Based on the contextual description of trivial uses and knowledge, “frivolous” means useless or unnecessary. So if the author believes that individuals not involved in business are unnecessarily using smart phones, that the author would think that these people do not need smart phones (choice "believes that the average individual does not need a smart phone."). The author makes no mention of their specific hopes for how the technology will turn out in the future, so choice "hopes that technology ceases to expand its scope." and choice "wants to see more developments added to smart phone technology." can be eliminated. The authors matter-of-fact tone allows you to rule out “fascination” (choice "is fascinated by the endless capabilities on smart phones."), and there is no evidence to support whether or not the author has a smart phone (choice "has a smart phone."). Choice "believes that the average individual does not need a smart phone." is the best option.
The conclusion sentence states two possible paths that could explain the arrival of a growth in smart phone popularity. These two suppositions are guesses at what is causing this trend. Because the author injects minimal bias and leaves the answer to the reader’s interpretation, the author is simply presenting explanations as choice E indicates. The other choices are either irrelevant or insufficiently supported by text evidence.
The answer is "Human society will survive despite the serious threat of total annihilation.", because the author talks about survival and the threats of annihilation.
The answer is "Advancing to the stage of war but not engaging in it.", because he wanted the war to start, but she wanted to keep peace and not show that he was encouraging it.
The answer is "Nations in possession of huge stockpiles of lethal weapons are trying hard to avoid actual conflict." , because the author clearly states the opinion of nations in possession of huge stockpiles of lethal weapons are trying hard to avoid actual conflict.
The answer is "unrestrainable", because irrepressible means unrestrainable. Which means death or a dark side.