What is the best definition for the word recourse?

The term "recourse" refers to a source of help or support that one can turn to in difficult situations, often implying a means of remedy or an option available to address a particular issue. When someone has recourse to something, it suggests that they have an alternative strategy or solution that can be utilized when facing challenges.

In this context, the choice of "option" aligns perfectly with the definition, as it encapsulates the idea of having a choice or resource available to resolve a problem. On the other hand, the other terms suggest different meanings: "ambush" involves surprise attack, "obligation" indicates a duty or responsibility, and "proposal" refers to a suggestion or plan put forward for consideration. None of these alternatives capture the essence of having a fallback or an alternative course of action as "recourse" does.