INTERNATIONAL ONLY 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 __________.

Correct Answer: Option B — one prolonged, one short, one prolonged, and one short blast

Under International Rule 34(c)(ii), when an overtaken vessel in a narrow channel agrees to allow passage, it confirms concurrence by sounding the assent signal consisting of one prolonged, one short, one prolonged, and one short blast in that exact sequence.