Which sentence suggests that other countries do not use daylight saving time?
A. In the United States, DST was first used during World War I to conserve fuel and energy.
B. For these reasons, the United States should reconsider whether DST still makes sense.
C. Americans do not need daylight saving time for many reasons.
D. Another reason is that computer systems communicate with each other around the world, and when one country changes
their clocks, it can create problems for other countries.

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