INTERNATIONAL ONLY A signal of one prolonged, one short, one prolonged, and one short blast, in that order is given by a vessel __________.

Correct Answer: Option A — being overtaken in a narrow channel

COLREG Rule 34(c)(ii) prescribes the Morse 'N' signal consisting of one prolonged, one short, one prolonged, and one short blast for a vessel being overtaken in a narrow channel.