In 1667, what precursor to the telephone was invented?

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Source:

  • Choice "A": Semaphore system % of users selected this choice.
  • Choice "B": Tin can phone % of users selected this choice.
  • Choice "C": Telegraph % of users selected this choice.
  • Choice "D": Morse code % of users selected this choice.
Did you know...
One of the most popular myths about president George Washington was that he had wooden teeth. However, while it is known that he had several dental problems and used dentures, there is no record of wood ever having been used as a material.
Image credit: Alexander Andrews.