Final answer:
The stand-on vessel should not turn to port for a vessel on her own port side to avoid collision, as per navigation rules.
Step-by-step explanation:
The question pertains to the rules of navigation to avoid collisions at sea, which are laid out in the International Regulations for Preventing Collisions at Sea (COLREGs). Specifically, it refers to the actions a stand-on vessel should avoid when it becomes necessary to take action to prevent a collision. The correct answer would be that if it becomes necessary for a stand-on vessel to take action to avoid collision, she shall NOT, if possible, turn to port for a vessel on her own port side. This is because making such a maneuver could potentially decrease the predictability of the vessel's movements and increase the risk of collision, especially if the other vessel is also taking evasive action.