Answer :
After reading and analyzing the paragraph about microscopes, we can choose the following option as the one containing the author's purpose:
A. To explain that real microscopes have video capability superior to smartphone microscopes.
What is purpose?
Purpose is an author's objective or goal when writing. For example, an author may have the purpose to inform readers of a fact, like in a newspaper article. He can also have the purpose to entertain, like in some blogs.
In the passage, the author compares smartphone microscopes to real microscopes. His purpose is to show that a real microscope can do what a smartphone one does and more.
Real microscopes, like smartphone ones, can record a video. But, besides that, their magnification is way higher.
With the information above in mind, we can choose letter A as the best option.
Learn more about purpose here:
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