How can you tell that his statement from “The Eternal Frontier” is an opinion?

In 1900 there were 144 miles of surfaced road in the United States.

A. It contains a statistic.
B. It can be proved true.
C. It comes from a reference book.

One of the author’s purposes in the code book is to explain different types of codebreaking to his readers. which line best demonstrates this purpose? a theoretical breakthrough would be a fundamentally new way of finding alice's private key mathematicians have been studying factoring for centuries, and modern factoring techniques are not significantly better than ancient techniques a more recent development is the so-called tempest attack, which aims to detect the electromagnetic signals emitted . . in a computer's display unit if scientists could build a quantum computer, it would be able to perform calculations with . . enormous speed

How can miscommunication cause a tragedy?

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