The correct answer to this open question is the following.
Although the question does not provide options, we can say the following.
The syndrome is the Presidential assassination syndrome.
Lee Harvey Oswald was the material author of the assassination of US President JF Kennedy. He killed the President on November 22, 1963, in Dallas, Texas. The US federal governed opened the Warren Commission to investigate the case. Oswald was interrogated and after so many investigations, the commission stated that he was the only author of the assassination. But just a few believed this version, open to the idea of many conspiracies, including Cuban Communists, the CIA, and organized crime.
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It depends on how you use it. If an individual is using a cellphone for his/her entertainment even though the professor/teacher is having a lecture, then it is unethical. But if the individual is using his/her own phone for an emergency matter then it should be considered.
D.
For example in New York, the Erie Canal was dug to connect Lake Erie in western NY to Hudson River in eastern side of NY.
Waterway built to allow ship travel vs. slower overland wagons etc.
