BOTH INTERNATIONAL & INLAND Two power-driven vessels are crossing as shown in illustration D042RR below. Vessel "A" sounds two short blasts on the whistle. You are on vessel "B" and are in doubt that sufficient action is being taken by vessel "A" to avoid collision. What action should you take?

Correct Answer: Option B — Sound five or more short and rapid blasts

Rule 34(d) requires that when vessels in sight of one another fail to understand the intentions of the other, or are in doubt whether sufficient action is being taken to avoid collision, the vessel in doubt shall immediately indicate such doubt by sounding at least five short and rapid blasts.