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The main idea of the paragraph is that e-mail--

A. is not always the easiest way to connect people from distant offices .
B. causes people to be unproductive when it is used incorrectly.
C. is effective for certain kinds of messages but only managed wisely
D. has charged considerably since it first began a decade ago.
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সঠিক উত্তরঃ C. is effective for certain kinds of messages but only managed wisely
Explanation: