Which word refers to something that is usable, able to survive, or capable of success?

The term "viable" refers to something that is capable of working successfully, surviving, or being effective in a given context. This concept can apply to various scenarios, such as business plans, strategies, or ecosystems. For example, a viable business model is one that has the potential to grow and succeed in the market, while a viable species is one that can survive and thrive in its environment.

The context in which "viable" is used highlights its significance in discussions about sustainability, practicality, and effectiveness, making it the most suitable choice among the options provided. Other options focus on different meanings; for instance, “vex” means to annoy, “vilify” means to speak ill of someone, and “voracious” describes an insatiable appetite, typically for food or knowledge, none of which convey the idea of utility or potential for success.