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The main idea of the paragraph is that e-mail

A. causes people to be unproductive when it is used incorrectly
B. has changed considerable since it first began a decade and a half ago
C. is not always the easiest way to connect people from distance office
D. is effective for certain kinds of message but only if managed wisely
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সঠিক উত্তরঃ A. causes people to be unproductive when it is used incorrectly
Explanation: