INLAND ONLY Two power-driven vessels, "A" and "B" , are meeting on a river as shown in illustration D041RR below and will pass about 1/4 mile apart. What action should the vessels take?

Correct Answer: Option B — The vessels should exchange two blast whistle signals and pass starboard to starboard.

33 CFR 83.34(a) dictates that when vessels are meeting on a river and intend to pass starboard-to-starboard, they must exchange two short blasts. This signal confirms the agreement to deviate from the standard port-to-port passing arrangement, ensuring both vessels are aware of the intended maneuver.