Navigation Rules Practice Test

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You are underway in a narrow channel, and you are being overtaken by a vessel astern. After the overtaking vessel sounds the proper signal indicating his intention to pass your vessel on your starboard side, you signal your agreement by sounding __________.
  A. one short blast 
  B. two prolonged blasts
  C. two prolonged followed by two short blasts
  D. one prolonged, one short, one prolonged, and one short blast in that order