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Question:

What is the purpose of the conclusion sentence?

A Present two possible explanations for the growing popularity of smart phones
Explaination

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.