What was the outcome expected from the volunteers' efforts?

The choice indicating that the expected outcome was to avert a catastrophe is correct because it implies a proactive approach taken by the volunteers to prevent a significant or disastrous event. This suggests that their efforts were driven by an urgent need to address a pressing issue that could lead to severe consequences. Understanding this context illustrates that the volunteers were likely focused on a mission that carried an inherent risk or danger, and their actions were aimed at reducing or eliminating that threat altogether.

In contrast, while gaining recognition or gathering community support might be positive byproducts of their efforts, they do not directly pertain to an immediate need to prevent a catastrophe. Succeeding in their mission also implies reaching a goal, but the particular emphasis on averting a catastrophe captures the urgency and seriousness of their actions more accurately. Thus, the chosen option emphasizes the critical nature of the volunteers' work and its intended impact on the community or environment.