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 __________.

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
E