53. Given that all the choices are accurate, which one sets up the clearest, most logical contrast with the claim made in the next part of the sentence?
Your Answer is
Correct Answer is B
Explanation
The title requires the clearest contrast to the second half of the sentence, and the second half of the sentence means "spelling out and translating information in Morse code does not require a professional machine." Therefore, the first half of the sentence should indicate the role of the machine in recording Morse code, Therefore option B is the most appropriate.
Item A: Comparing Morse code and other electrical coding systems has nothing to do with whether the latter sentence requires a professional machine.
Item C: Comparing dash and dot has nothing to do with using machines.
Item D: Whether the code has undergone changes has nothing to do with the use of machines.