INLAND ONLY In a narrow channel, a power-driven vessel desiring to overtake another power-driven vessel on the other vessel's starboard side will sound a whistle signal of __________.

Correct Answer: Option D — one short blast

Under Inland Rule 34(a), one short blast indicates 'I intend to leave you on my port side' (port-to-port pass), requiring a confirming one short blast from the other vessel.