The correct answer is C) use rudder to check the swing. The helm command "meet her" refers to using the rudder to check the swing of the vessel, or to steer the vessel in a way that counters its current movement and brings it back on course. This is done by applying a small amount of rudder to oppose the vessel's swing and keep it steady on the desired heading. The other options are incorrect because A) simply maintaining the current course is not the purpose of the "meet her" command, B) steering more carefully is too vague, and D) decreasing the rudder angle is the opposite of what is needed to check the swing.