What is the purpose of the conclusion sentence?

Read the following passage and answer the question.

Technology is rapidly expanding the scope of capabilities for both professional and personal use; such is the case with smart phones. Professionals now have devices available to them capable of digital media, internet access, phone communication, multi-person scheduling and office tools for documents and presentations. Businesspeople that are often mobile may maximize the use of these critical features on smart phones. Individuals who simply enjoy the luxury of multi-function devices often use these devices for frivolous pursuits such as downloading catchy ring tones, instant messaging about the latest gossip and looking up the world record for most cans crushed on one’s head during the Superbowl. This fusion of capabilities and increased availability of such devices could be a sign of a growing blend in society between work and personal life, or individuals could simply be taking a luxurious approach to their connectivity in personal lives.

What is the purpose of the conclusion sentence?
A . Draw a conclusion about what we know smart phones can do
B . Assume where technology is headed and how it will affect society
C . Comment on human connectivity through the use of smart phones
D . Predict how the government will regulate and guide future technology
E . Present two possible explanations for the growing popularity of smart phones

Answer: E

Explanation:

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 “Present two possible explanations for the growing popularity of smart phones” indicates. The other choices are either irrelevant or insufficiently supported by text evidence.