What action should you take when your power-driven vessel meets another vessel head-on?

Answer: A — Exchange one short blast

When two power-driven vessels meet head-on, the proper action according to the Rules of the Road is to sound one short blast. This signal indicates a desire to pass each other starboard to starboard. The communication is essential for safety, as it helps establish intentions between vessels. The rationale behind using one short blast in this scenario is connected to the fundamental rule of navigating safely in close quarters with other vessels. It is part of the signaling system that helps prevent collisions by clarifying intentions and actions between the approaching vessels. In other scenarios listed, such as sounding one prolonged blast or altering course in certain ways, they relate to different situations and do not apply to head-on encounters. Therefore, understanding the significance of these signals and when to use them is crucial for maintaining navigational safety on the water.